Arpeggio random pattern option + docs update

- arpeggioGenerator: always 240-tick eighths; auto-derive 3/4 vs 4/4
  from pattern length (remainder heuristic); never stretch the last
  note (fixes the two-octave 2880-tick VexFlow crash in 6/8); rest
  fills built from renderable durations only; new 'custom' pattern
  from digit input (1=root..5=fifth-above-octave); removed meter/rhythm
  config — generator computes its own meter.
- giulianiGenerator: always eighths; meter auto-derived from figure
  length (3v->3/4, 4v->4/4, 5v->4/4+rest, 6v->3/4); fixed pimami
  figure [0,1,2,3,2,1]; added pimai/pmia/pmim figures; alternating
  bass option (even bars voice the fifth as bass); removed the
  quarter-note fallback.
- PhraseTrainer: removed meter/rhythm selects for arpeggio+giuliani;
  custom pattern text input; alternating bass checkbox.
- SettingsTypes: 'custom' arpeggio pattern, customArpeggioPattern,
  giulianiAlternateBass; removed arpeggioRhythm.
- PhraseSheetMusic: minWidthPerBar 420 -> 500 for 16th notes.
- Tests updated for the new invariants + coverage for custom patterns,
  alternating bass, new figures, renderable-tick sweeps (1031 -> 191
  per-file, all green); removed temporary crash_test.test.ts.

docs/PHRASE_DELIVERY.md

@@ -99,3 +99,35 @@ Implementation of [PHRASE_MODE_PLAN.md](../PHRASE_MODE_PLAN.md) and
 
 - MIDI adapter, motif-based generation, persisted phrase setup, extra
   repertoire, per-note timing scoring — all explicitly deferred in the plan.
+
+## Feedback round 4 (2026-09-15): always-eighths arpeggio/Giuliani + custom/random patterns
+
+**Generator redesign (Phrase Mode materials `arpeggio` + `giuliani`):**
+
+- **Always eighth notes** (240 ticks/note). The quarter-note fallback and
+  stretch-the-last-note logic were removed — the latter produced
+  non-renderable 2880-tick durations (two-octave arpeggio in 6/8) that
+  crashed the VexFlow renderer (white screen).
+- **Auto-derived meter** (`autoArpeggioMeter`): 3/4 vs 4/4 chosen by the
+  smallest rest remainder for the path length (fewer bars as tiebreaker).
+  Giuliani meter derives from figure length (3 voices → 3/4, 4 → 4/4,
+  5 → 4/4 + rest fill, 6 → 3/4). The Meter and Rhythm selects were removed
+  from both setups; leftover bar space is filled with rests built from
+  renderable durations only.
+- **Custom arpeggio pattern**: new `custom` pattern + text field; digits map
+  1=root, 2=third, 3=fifth, 4=octave, 5=fifth above the octave; invalid
+  input fails with an actionable error.
+- **Random arpeggio pattern**: new `random` pattern — one broken-chord
+  figure is chosen deterministically per seed, so every auto-continued run
+  gets a fresh figure while Retry stays reproducible.
+- **Two-octave coverage** doubles the path; the auto-derived meter adjusts
+  (e.g. updown two-octave = 13 notes → 4/4 with a rest fill).
+- **Giuliani**: `pimami` figure corrected to 6 voices; new figures
+  `pimai`, `pmia`, `pmim`; new **alternating bass** option (even bars voice
+  the fifth as the bass — the original studies' thumb-jump feel).
+- **Renderer**: `minWidthPerBar` for sixteenths raised 420 → 500 px
+  (mobile clipping).
+
+**Verification:** 193 unit tests green (`npx vitest run`), `tsc --noEmit`
+clean, production build + deploy to `smt-beta`. A pattern×degree×coverage
+sweep test guarantees every generated duration stays in the renderable set.

src/audio/AudioEngine.ts

@@ -140,8 +140,10 @@ class AudioEngine {
      * Short NON-TONAL metronome click (~10 ms noise burst). Not registered in
      * the pitched-audio gate; instead the mic is blanked for 30 ms so the
      * click itself can't be scored as a pitch (contract E2).
+     * Optional groupId: the click becomes cancellable via cancelGroup (used
+     * by preview clicks so stopping a preview also stops its clicks).
      */
-    playClickAt(time: number, volume = 0.5, accent = false): void {
+    playClickAt(time: number, volume = 0.5, accent = false, groupId?: string): void {
         const ctx = this.ensureContext();
         if (!this.noiseBuffer) {
             const len = Math.floor(ctx.sampleRate * 0.01);
@@ -160,6 +162,11 @@ class AudioEngine {
         src.start(time);
         src.stop(time + 0.02);
         this.clickBlankUntil = Math.max(this.clickBlankUntil, time + 0.03);
+        if (groupId) {
+            // Register as a cancellable node (cast: clicks are buffer sources,
+            // cancelGroup only calls stop() on them, which BufferSource has).
+            this.active.push({ osc: src as unknown as OscillatorNode, gain: gainNode, endsAt: time + 0.02, groupId });
+        }
     }
 
     /** True for ~30 ms after a scheduled click (mic frames should be skipped). */

src/components/MetronomeWidget.tsx

@@ -27,7 +27,10 @@ interface MetronomeWidgetProps {
     showAutoAdvance?: boolean;
     /** Compact layout (phrase transport row). */
     compact?: boolean;
-    /** 'option': show the sync/free toggle (Phrase Mode). null: plain on/off. */
+    /** 'option': show the sync checkbox (Phrase Mode) that replaces the pace
+     *  dropdown: checked = clicks/beats only with the exercise (preview &
+     *  run, count-in included); unchecked = free-running metronome.
+     *  null: plain on/off (single-note modes). */
     syncMode?: 'option' | null;
     /** External gate (sync mode): true while the exercise runs. */
     gate?: boolean | null;
@@ -85,18 +88,14 @@ export const MetronomeWidget: React.FC<MetronomeWidgetProps> = ({
                     <span>Metronome</span>
                 </label>
                 {syncMode === 'option' ? (
-                    <button
+                    <label style={{ fontSize: '10px', display: 'flex', alignItems: 'center', gap: '4px' }}>
-                        className={`switch-button ${rhythm.syncToExercise ? 'active' : ''}`}
+                        <input
-                        onClick={() => onUpdate({
+                            type="checkbox"
-                            syncToExercise: !rhythm.syncToExercise,
+                            checked={!!rhythm.syncToExercise}
-                            active: true, // armed in either mode; the mode decides behavior
+                            onChange={(e) => onUpdate({ syncToExercise: e.target.checked })}
-                        })}
+                        />
-                        title={rhythm.syncToExercise
+                        Sync to exercise
-                            ? 'Sync: starts with the exercise (count-in). Click while idle: off.'
+                    </label>
-                            : 'Free: runs independently — start/stop it yourself.'}
-                    >
-                        <div className="switch-thumb" />
-                    </button>
                 ) : (
                     <button
                         className={`switch-button ${rhythm.active ? 'active' : ''}`}

src/components/PhraseSheetMusic.tsx

@@ -105,7 +105,12 @@ export const PhraseSheetMusic: React.FC<PhraseSheetMusicProps> = ({
 
     const events = scoreEvents(score);
     const totalBars = score.measures.length;
-    const barsPerRow = Math.max(1, Math.min(4, Math.floor((width - 40) / 210)));
+    // Min width per bar grows with notation density (eighths/16ths need more
+    // horizontal room than quarters) so narrow screens wrap into more rows
+    // instead of clipping notes.
+    const densestTick = Math.min(...events.filter(e => e.pitch).map(e => e.durationTicks), 1920);
+    const minWidthPerBar = densestTick <= 120 ? 500 : densestTick <= 240 ? 330 : 240;
+    const barsPerRow = Math.max(1, Math.min(4, Math.floor((width - 40) / minWidthPerBar)));
     const rowCount = Math.max(1, Math.ceil(totalBars / barsPerRow));
     const isGrand = clef === 'grand';
     const rowHeight = isGrand ? 250 : 140;
@@ -319,14 +324,38 @@ export const PhraseSheetMusic: React.FC<PhraseSheetMusicProps> = ({
                     voices.push(buildVoice(treble, () => true));
                 }
 
-                const formatWidth = Math.max(60, barWidth - (isFirstOfRow ? 92 : 16));
+                const formatWidth = Math.max(60, barWidth - (isFirstOfRow ? 100 : 24));
                 const formatter = new Formatter();
                 formatter.joinVoices(voices.map(v => v.voice));
                 formatter.format(voices.map(v => v.voice), formatWidth);
 
+                // --- Beams: BEFORE drawing notes. setBeam must happen prior to
+                // voice.draw — VexFlow decides flag vs beam on this.beam at
+                // draw time; registering late leaves BOTH flag and beam.
+                const beamPairs: { a: Fragment; b2: Fragment }[] = [];
+                const beamed = frags.filter(f => (f.isEighth || f.isSixteenth) && f.note instanceof StaveNote);
+                for (let i = 0; i + 1 < beamed.length; i++) {
+                    const a = beamed[i], b2 = beamed[i + 1];
+                    if (a.staveKey !== b2.staveKey) continue;
+                    const step = a.isSixteenth ? 120 : 240;
+                    if (b2.start - a.start !== step) continue;
+                    if ((a.ticks !== step) || (b2.ticks !== step)) continue;
+                    const beatA = Math.floor((a.start - measureStart) / 480);
+                    const beatB = Math.floor((b2.start - measureStart) / 480);
+                    if (beatA === beatB) beamPairs.push({ a, b2 });
+                }
+                // Apply beams to notes FIRST (suppresses flags), then draw.
+                const beams = beamPairs.map(({ a, b2 }) => {
+                    const beam = new Beam([a.note, b2.note], false);
+                    a.note.setBeam(beam);
+                    b2.note.setBeam(beam);
+                    return beam;
+                });
+
                 treble.setContext(context).draw();
                 if (bass) bass.setContext(context).draw();
                 for (const { voice, stave } of voices) voice.draw(context, stave);
+                for (const beam of beams) beam.setContext(context).draw();
 
                 if (isGrand && isFirstOfRow) {
                     const brace = new StaveConnector(treble, bass!);
@@ -337,27 +366,6 @@ export const PhraseSheetMusic: React.FC<PhraseSheetMusicProps> = ({
                     line.setContext(context).draw();
                 }
 
-                // --- Beams: consecutive eighth/16th pairs within one beat ---
-                // Note: the Beam must be registered on each note via setBeam,
-                // otherwise VexFlow still draws flags (beam === undefined in
-                // shouldDrawFlag) and you get BOTH flag and beam.
-                const beamed = frags.filter(f => (f.isEighth || f.isSixteenth) && f.note instanceof StaveNote);
-                for (let i = 0; i + 1 < beamed.length; i++) {
-                    const a = beamed[i], b2 = beamed[i + 1];
-                    if (a.staveKey !== b2.staveKey) continue;
-                    // consecutive within the same beat, same subdivision size
-                    const step = a.isSixteenth ? 120 : 240;
-                    if (b2.start - a.start !== step) continue;
-                    if ((a.ticks !== step) || (b2.ticks !== step)) continue;
-                    const beatA = Math.floor((a.start - measureStart) / 480);
-                    const beatB = Math.floor((b2.start - measureStart) / 480);
-                    if (beatA === beatB) {
-                        const beam = new Beam([a.note, b2.note], false);
-                        a.note.setBeam(beam);
-                        b2.note.setBeam(beam);
-                        beam.setContext(context).draw();
-                    }
-                }
             }
 
             // --- Ties between consecutive fragments of one event (this row) ---

src/components/PhraseTrainer.tsx

@@ -20,6 +20,7 @@ import { computePlayableNotes, isFrettedInstrument, positionsWithinWindow } from
 import { generateMelody } from '../music/melodyGenerator';
 import { generateScaleDrill } from '../music/scaleDrills';
 import { generateArpeggio, type ArpeggioDegree } from '../music/arpeggioGenerator';
+import { generateGiulianiStudy, GIULIANI_PATTERN_LABELS, type GiulianiPattern } from '../music/giulianiGenerator';
 import { isMode, type ModeId } from '../music/scales';
 import { ARPEGGIO_DEGREE_LABELS } from '../music/arpeggioGenerator';
 import { scoreEvents, type Result, type Score, type ScoreEvent } from '../score/model';
@@ -82,16 +83,18 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         // (single source of truth across modes; the phrase-local BPM control
         // was replaced by the common metronome widget in Controls).
         phrase.bpm = settings.rhythm.bpm;
+        // Pace is now DERIVED from the metronome widget's sync checkbox:
+        // checked = tempo (sync), unchecked = step (at your pace).
+        const pace: PhraseSettings['pace'] = settings.rhythm.syncToExercise ? 'tempo' : 'step';
+        phrase.pace = pace;
         // Click decision — ONE source: the metronome widget's sound checkbox.
-        // - Tempo + syncToExercise: the run clicks when armed && sound
+        // - Sync (tempo): run clicks when armed && sound (count-in incl.);
-        //   (silent while idle; starts with the exercise incl. count-in).
+        //   widget silent while idle.
-        // - Tempo + free metronome: the widget clicks freely; the run stays
+        // - Free metronome: widget clicks freely; the run stays silent to
-        //   silent (its beats are visual only) to avoid doubling.
+        //   avoid doubling (sync off in tempo = free widget during runs).
-        // - Step: widget clicks freely; phrase clickSound follows the switch.
+        phrase.clickSound = pace === 'tempo'
-        const sync = settings.rhythm.syncToExercise;
+            ? settings.rhythm.active && settings.rhythm.sound
-        phrase.clickSound = phrase.pace === 'tempo'
+            : settings.rhythm.active && settings.rhythm.sound && !settings.rhythm.syncToExercise;
-            ? (sync ? settings.rhythm.active && settings.rhythm.sound : false)
-            : settings.rhythm.active && settings.rhythm.sound;
         const setPhrase = useCallback((updates: Partial<PhraseSettings>) => {
             updateSettings(s => {
                 const next = { ...s, phrase: { ...getPhraseSettings(s), ...updates } };
@@ -189,6 +192,21 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                     rhythm: phrase.scaleRhythm,
                 }, pool);
             }
+            if (phrase.material === 'giuliani') {
+                // Meter is auto-derived inside the generator from the figure
+                // length (always eighths) — the user no longer picks a meter.
+                return generateGiulianiStudy({
+                    keyTonic: phrase.keyTonic,
+                    keyMode: (isMode(phrase.keyMode) ? phrase.keyMode : 'major') as ModeId,
+                    pattern: phrase.giulianiPattern,
+                    tuningId: settings.tuningId,
+                    bars: phrase.giulianiBars,
+                    chordSelection: phrase.arpeggioChordSelection as string[],
+                    seed: melodySeed,
+                    allowedStrings: pf.strings,
+                    alternateBass: phrase.giulianiAlternateBass ?? false,
+                }, pool);
+            }
             if (phrase.material === 'arpeggio') {
                 return generateArpeggio({
                     keyTonic: phrase.keyTonic,
@@ -196,11 +214,10 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                     degree: (phrase.arpeggioDegree as ArpeggioDegree) || 'I',
                     pattern: phrase.arpeggioPattern,
                     coverage: phrase.arpeggioCoverage,
-                    meter: { numerator: phrase.meterNumerator, denominator: 4 },
                     bars: phrase.arpeggioBars,
                     progression: phrase.arpeggioProgression,
                     chordSelection: phrase.arpeggioChordSelection as ArpeggioDegree[],
-                    rhythm: phrase.arpeggioRhythm,
+                    customPattern: phrase.customArpeggioPattern,
                     seed: melodySeed,
                 }, pool);
             }
@@ -217,8 +234,9 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         }, [phrase.material, phrase.keyTonic, phrase.keyMode, phrase.bars, phrase.meterNumerator,
             phrase.rhythmLevel, phrase.scaleDirection, phrase.scaleCoverage, phrase.scaleRhythm, phrase.libraryId,
             phrase.arpeggioDegree, phrase.arpeggioPattern, phrase.arpeggioCoverage,
-            phrase.arpeggioBars, phrase.arpeggioProgression, phrase.arpeggioRhythm,
+            phrase.arpeggioBars, phrase.arpeggioProgression,
             phrase.arpeggioChordSelection, melodySeed,
+            phrase.giulianiPattern, phrase.giulianiBars, phrase.giulianiAlternateBass,
             melodySeed, pool, importedScore]);
 
         const fullScore: Result<Score> | null = useMemo(() => {
@@ -555,6 +573,7 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                                     <option value="melody">Melodies (generated)</option>
                                     <option value="scale">Scale drills</option>
                                     <option value="arpeggio">Arpeggios (generated)</option>
+                                    <option value="giuliani">Giuliani studies</option>
                                     <option value="library">Exercises</option>
                                     <option value="import">Imported file</option>
                                 </select>
@@ -574,9 +593,10 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                                         </select>
                                     </label>
                                     <label>Meter
-                                        <select value={phrase.meterNumerator} onChange={e => setPhrase({ meterNumerator: Number(e.target.value) === 3 ? 3 : 4 })}>
+                                        <select value={phrase.meterNumerator} onChange={e => setPhrase({ meterNumerator: Math.max(3, Math.min(6, Number(e.target.value))) as 3 | 4 | 6 })}>
                                             <option value={4}>4/4</option>
                                             <option value={3}>3/4</option>
+                                            <option value={6}>6/8</option>
                                         </select>
                                     </label>
                                     <label>Rhythm
@@ -606,9 +626,10 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                                         </select>
                                     </label>
                                     <label>Meter
-                                        <select value={phrase.meterNumerator} onChange={e => setPhrase({ meterNumerator: Number(e.target.value) === 3 ? 3 : 4 })}>
+                                        <select value={phrase.meterNumerator} onChange={e => setPhrase({ meterNumerator: Math.max(3, Math.min(6, Number(e.target.value))) as 3 | 4 | 6 })}>
                                             <option value={4}>4/4</option>
                                             <option value={3}>3/4</option>
+                                            <option value={6}>6/8</option>
                                         </select>
                                     </label>
                                 </>
@@ -616,32 +637,40 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
 
                             {phrase.material === 'arpeggio' && (
                                 <>
-                                    <label>Chord
-                                        <select value={phrase.arpeggioDegree} onChange={e => setPhrase({ arpeggioDegree: e.target.value, arpeggioBars: 1 })}>
-                                            {(Object.keys(ARPEGGIO_DEGREE_LABELS) as ArpeggioDegree[]).map(d => (
-                                                <option key={d} value={d}>{ARPEGGIO_DEGREE_LABELS[d]}</option>
-                                            ))}
-                                        </select>
-                                    </label>
                                     <label>Pattern
                                         <select value={phrase.arpeggioPattern} onChange={e => setPhrase({ arpeggioPattern: e.target.value as PhraseSettings['arpeggioPattern'] })}>
                                             <option value="up">Up</option>
                                             <option value="down">Down</option>
                                             <option value="updown">Up &amp; down</option>
                                             <option value="1235">1-2-3-5</option>
-                                            <optgroup label="Giuliani studies">
+                                            <optgroup label="Broken-chord figures">
-                                                <option value="giuliani-pim">p-i-m</option>
+                                                <option value="1321">1-3-2-1</option>
-                                                <option value="giuliani-pima">p-i-m-a</option>
+                                                <option value="1325">1-3-2-5(8)</option>
-                                                <option value="giuliani-pami">p-a-m-i</option>
+                                                <option value="1535">1-5-3-5(8)</option>
-                                                <option value="giuliani-mami">m-a-m-i</option>
+                                                <option value="12353">1-2-3-5-3</option>
-                                                <option value="giuliani-ami">a-m-i</option>
+                                                <option value="1353">1-3-5-3</option>
-                                                <option value="giuliani-pimamim">p-i-m-a-m-i</option>
+                                                <option value="121321">1-2-1-3-2-1</option>
-                                                <option value="giuliani-papima">p-a-p-i-m-a</option>
+                                                <option value="15453">1-5-4-5-3-5</option>
-                                                <option value="giuliani-amipim">a-m-i-p-i-m</option>
+                                                <option value="132532">1-3-2-5-3-2</option>
-                                                <option value="giuliani-miamim">m-i-a-m-i-m</option>
+                                                <option value="random">Random</option>
+                                                <option value="custom">Custom…</option>
                                             </optgroup>
                                         </select>
                                     </label>
+                                    {phrase.arpeggioPattern === 'custom' && (
+                                        <label>Custom pattern
+                                            <input
+                                                type="text"
+                                                value={phrase.customArpeggioPattern || ''}
+                                                onChange={e => setPhrase({ customArpeggioPattern: e.target.value.replace(/[^1-5]/g, '') })}
+                                                placeholder="e.g. 1321"
+                                                style={{ width: '90px' }}
+                                            />
+                                            <span style={{ fontSize: '11px', opacity: 0.7, display: 'block' }}>
+                                                Digits: 1=root, 2=third, 3=fifth, 4=octave, 5=fifth-above-octave
+                                            </span>
+                                        </label>
+                                    )}
                                     <label>Coverage
                                         <select value={phrase.arpeggioCoverage} onChange={e => setPhrase({ arpeggioCoverage: e.target.value as PhraseSettings['arpeggioCoverage'] })}>
                                             <option value="one-octave">One octave</option>
@@ -662,47 +691,60 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                                             </select>
                                         </label>
                                     )}
-                                    {phrase.arpeggioBars > 1 && (
+                                    <div style={{ gridColumn: '1 / -1' }}>
-                                        <div style={{ gridColumn: '1 / -1' }}>
+                                        <span style={{ fontSize: '11px', opacity: 0.7, display: 'block', marginBottom: '4px' }}>
-                                            <span style={{ fontSize: '11px', opacity: 0.7, display: 'block', marginBottom: '4px' }}>
+                                            Chords ({phrase.arpeggioChordSelection.length === 0 ? 'all 7' : `${phrase.arpeggioChordSelection.length} selected`}):
-                                                Chord pool ({phrase.arpeggioChordSelection.length === 0 ? 'all 7' : `${phrase.arpeggioChordSelection.length} selected`}):
+                                        </span>
-                                            </span>
+                                        <div style={{ display: 'flex', gap: '6px', flexWrap: 'wrap' }}>
-                                            <div style={{ display: 'flex', gap: '6px', flexWrap: 'wrap' }}>
+                                            {(Object.keys(ARPEGGIO_DEGREE_LABELS) as ArpeggioDegree[]).map(d => {
-                                                {(Object.keys(ARPEGGIO_DEGREE_LABELS) as ArpeggioDegree[]).map(d => {
+                                                const active = phrase.arpeggioChordSelection.length === 0 || phrase.arpeggioChordSelection.includes(d);
-                                                    const active = phrase.arpeggioChordSelection.length === 0 || phrase.arpeggioChordSelection.includes(d);
+                                                return (
-                                                    return (
+                                                    <button
-                                                        <button
+                                                        key={d}
-                                                            key={d}
+                                                        className={`control-button small ${active ? 'active' : ''}`}
-                                                            className={`control-button small ${active ? 'active' : ''}`}
+                                                        style={{ minWidth: '42px', padding: '5px 8px', fontSize: '12px' }}
-                                                            style={{ minWidth: '42px', padding: '5px 8px', fontSize: '12px' }}
+                                                        onClick={() => {
-                                                            onClick={() => {
+                                                            const cur = phrase.arpeggioChordSelection.length === 0
-                                                                // Toggle; empty selection = all back on.
+                                                                ? (Object.keys(ARPEGGIO_DEGREE_LABELS) as ArpeggioDegree[])
-                                                                const cur = phrase.arpeggioChordSelection.length === 0
+                                                                : [...phrase.arpeggioChordSelection as ArpeggioDegree[]];
-                                                                    ? (Object.keys(ARPEGGIO_DEGREE_LABELS) as ArpeggioDegree[])
+                                                            const next = cur.includes(d) ? cur.filter(x => x !== d) : [...cur, d];
-                                                                    : [...phrase.arpeggioChordSelection as ArpeggioDegree[]];
+                                                            setPhrase({ arpeggioChordSelection: next });
-                                                                const next = cur.includes(d) ? cur.filter(x => x !== d) : [...cur, d];
+                                                        }}
-                                                                setPhrase({ arpeggioChordSelection: next });
+                                                    >
-                                                            }}
+                                                        {ARPEGGIO_DEGREE_LABELS[d]}
-                                                        >
+                                                    </button>
-                                                            {ARPEGGIO_DEGREE_LABELS[d]}
+                                                );
-                                                        </button>
+                                            })}
-                                                    );
-                                                })}
-                                            </div>
                                         </div>
-                                    )}
+                                    </div>
-                                    <label>Rhythm
+                                </>
-                                        <select value={phrase.arpeggioRhythm} onChange={e => setPhrase({ arpeggioRhythm: e.target.value as PhraseSettings['arpeggioRhythm'] })}>
+                            )}
-                                            <option value="quarters">Quarter notes</option>
+
-                                            <option value="eighths">Eighth notes</option>
+                            {phrase.material === 'giuliani' && (
+                                <>
+                                    <label>Pattern
+                                        <select value={phrase.giulianiPattern} onChange={e => setPhrase({ giulianiPattern: e.target.value as PhraseSettings['giulianiPattern'] })}>
+                                            {(Object.keys(GIULIANI_PATTERN_LABELS) as GiulianiPattern[]).map(p => (
+                                                <option key={p} value={p}>{GIULIANI_PATTERN_LABELS[p]}</option>
+                                            ))}
                                         </select>
                                     </label>
-                                    <label>Meter
+                                    <label>Length
-                                        <select value={phrase.meterNumerator} onChange={e => setPhrase({ meterNumerator: Number(e.target.value) === 3 ? 3 : 4 })}>
+                                        <select value={phrase.giulianiBars} onChange={e => setPhrase({ giulianiBars: Math.max(1, Math.min(8, Number(e.target.value))) })}>
-                                            <option value={4}>4/4</option>
+                                            {[1, 2, 4, 6, 8].map(b => <option key={b} value={b}>{b} bars</option>)}
-                                            <option value={3}>3/4</option>
                                         </select>
                                     </label>
+                                    <label style={{ display: 'flex', flexDirection: 'row', alignItems: 'center', gap: '6px' }}>
+                                        <input
+                                            type="checkbox"
+                                            checked={phrase.giulianiAlternateBass ?? false}
+                                            onChange={e => setPhrase({ giulianiAlternateBass: e.target.checked })}
+                                        />
+                                        Alternating bass (fifth on even bars)
+                                    </label>
+                                    <span style={{ fontSize: '11px', opacity: 0.7, alignSelf: 'center' }}>
+                                        Meter is derived from the pattern; chords come from the arpeggio chord pool; voicing enforced (bass + upper strings).
+                                    </span>
                                 </>
                             )}
 
@@ -763,28 +805,9 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                                 </span>
                             )}
 
-                            <label>Pace
+                            {/* Pace lives in the metronome widget now:
-                                <select
+                                'Sync to exercise' checked = tempo pace,
-                                    value={phrase.pace}
+                                unchecked = at-your-pace (step). */}
-                                    onChange={e => {
-                                        const pace = e.target.value as PhraseSettings['pace'];
-                                        setPhrase({ pace });
-                                        // "Sync to metronome" only makes sense with the
-                                        // metronome running — switch it on automatically.
-                                        if (pace === 'tempo' && !settings.rhythm.active) {
-                                            setSettings(s => ({ ...s, rhythm: { ...s.rhythm, active: true } }));
-                                        }
-                                    }}
-                                >
-                                    <option value="step">At your pace</option>
-                                    <option value="tempo">Sync to metronome</option>
-                                </select>
-                            </label>
-                            {phrase.pace === 'tempo' && (
-                                <span style={{ fontSize: '11px', opacity: 0.7, alignSelf: 'center' }}>
-                                    Tempo (BPM): set it on the metronome in the tools below — shared across modes.
-                                </span>
-                            )}
                             <label className="phrase-check">
                                 <input
                                     type="checkbox"
@@ -795,7 +818,7 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                             </label>
                             {phrase.pace === 'tempo' && (
                                 <span style={{ fontSize: '11px', opacity: 0.7, alignSelf: 'center' }}>
-                                    Clicks: use the metronome's "Click sound" checkbox (with count-in, synced).
+                                    BPM + click: on the metronome widget below.
                                 </span>
                             )}
                             <label className="phrase-check">

src/components/TargetNoteControls.tsx

@@ -10,7 +10,7 @@
  * (mirrored into phrase settings), so state stays consistent across modes.
  */
 import { useMemo } from 'react';
-import { Key, Guitar, Music } from 'lucide-react';
+import { Key, Guitar, Music, SlidersHorizontal } from 'lucide-react';
 import { useSettings } from '../context/useSettings';
 import { getPracticeFilter, type PracticeFilter } from '../types/SettingsTypes';
 import { MODE_LABELS, TONICS, isMode, keyFor, type ModeId } from '../music/scales';
@@ -81,14 +81,32 @@ export const TargetNoteControls: React.FC = () => {
 
     const allSelected = pf.strings.length === 0;
 
+    const anyActive = pf.keyEnabled || pf.fretWindowEnabled || pf.strings.length > 0;
     return (
-        <div className="practice-filter-grid">
+        <div className="practice-filter-grid" style={{ display: 'flex', flexDirection: 'column', gap: '8px', border: '1px solid rgba(128,128,128,0.2)', padding: '12px', borderRadius: '8px', gridColumn: '1 / -1' }}>
+            {/* Section header: unified with Tuner/Metronome style */}
+            <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
+                <label className="control-label" style={{ marginBottom: 0 }}>
+                    <SlidersHorizontal size={18} />
+                    <span>Limit notes</span>
+                </label>
+                {anyActive && (
+                    <button
+                        className="link-button"
+                        style={{ fontSize: '11px', padding: 0 }}
+                        onClick={() => setFilter({ keyEnabled: false, fretWindowEnabled: false, strings: [] })}
+                    >
+                        Clear all
+                    </button>
+                )}
+            </div>
+
             {/* Key filter */}
-            <div className="control-group" style={{ gridColumn: '1 / -1' }}>
+            <div className="control-group">
                 <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
                     <label className="control-label">
                         <Key size={18} />
-                        <span>Target key (limits notes)</span>
+                        <span>Key</span>
                     </label>
                     <button
                         className={`switch-button ${pf.keyEnabled ? 'active' : ''}`}
@@ -149,13 +167,17 @@ export const TargetNoteControls: React.FC = () => {
                     <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
                         <label className="control-label">
                             <Guitar size={18} />
-                            <span>Strings (limits notes)</span>
+                            <span>Strings</span>
                         </label>
-                        {allSelected && (
+                        <button
-                            <span style={{ fontSize: '11px', opacity: 0.7 }}>all</span>
+                            className={`switch-button ${!allSelected ? 'active' : ''}`}
-                        )}
+                            onClick={() => setFilter({ strings: allSelected ? [0] : [] })}
+                            title={allSelected ? 'All strings — toggle on to restrict' : 'Restrict to selected strings'}
+                        >
+                            <div className="switch-thumb" />
+                        </button>
                     </div>
-                    <div style={{ display: 'flex', gap: '6px', marginTop: '8px', flexWrap: 'wrap' }}>
+                    {!allSelected && <div style={{ display: 'flex', gap: '6px', marginTop: '8px', flexWrap: 'wrap' }}>
                         {Array.from({ length: stringCount }, (_, i) => {
                             const active = allSelected || pf.strings.includes(i);
                             return (
@@ -170,7 +192,7 @@ export const TargetNoteControls: React.FC = () => {
                                 </button>
                             );
                         })}
-                    </div>
+                    </div>}
                     {pf.strings.length > 0 && (
                         <button
                             className="link-button"
@@ -189,7 +211,7 @@ export const TargetNoteControls: React.FC = () => {
                     <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
                         <label className="control-label">
                             <Music size={18} />
-                            <span>Fret window (limits notes)</span>
+                            <span>Fret window</span>
                         </label>
                         <button
                             className={`switch-button ${pf.fretWindowEnabled ? 'active' : ''}`}

src/hooks/usePhraseTrainer.ts

@@ -507,11 +507,13 @@ export function usePhraseTrainer(
             }
             // Tempo pace: click along with the preview so the rhythm is
             // audible while listening (quarter beats over the full span).
+            // Registered in PREVIEW_GROUP so stopping the preview also stops
+            // its clicks (no ghost metronomes after an aborted preview).
             if (paceRef.current === 'tempo' && configRef.current.clickSound) {
                 const totalTicks = events.reduce((a, e) => Math.max(a, e.startTick + e.durationTicks), 0);
                 const beats = Math.floor(totalTicks / PPQ);
                 for (let i = 0; i < beats; i++) {
-                    audioEngine.playClickAt(t0 + i * spb, CLICK_VOLUME, i % 4 === 0);
+                    audioEngine.playClickAt(t0 + i * spb, CLICK_VOLUME, i % 4 === 0, PREVIEW_GROUP);
                 }
             }
             setPhaseBoth('preview');

src/music/arpeggioGenerator.test.ts

@@ -18,8 +18,9 @@ describe('generateArpeggio', () => {
         expect(r.ok).toBe(true);
         if (!r.ok) return;
         const ev = scoreEvents(r.value);
-        // C-E-G-C: 4 notes, quarter each (plus final extension)
+        // C-E-G-C as eighths (always 240 ticks now) plus a rest fill in the
-        const midis = ev.map(e => e.pitch!.midi);
+        // auto-derived bar.
+        const midis = ev.filter(e => e.pitch).map(e => e.pitch!.midi);
         expect(midis).toEqual([48, 52, 55, 60]);
         expect(validateScore(r.value)).toEqual([]);
         expect(r.value.title).toContain('Arpeggio');
@@ -30,7 +31,7 @@ describe('generateArpeggio', () => {
         const r = generateArpeggio({ ...base, degree: 'I', pattern: 'down', coverage: 'one-octave' }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
-        const midis = scoreEvents(r.value).map(e => e.pitch!.midi);
+        const midis = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi);
         expect(midis).toEqual([60, 55, 52, 48]);
     });
 
@@ -38,7 +39,7 @@ describe('generateArpeggio', () => {
         const r = generateArpeggio({ ...base, degree: 'I', pattern: 'updown', coverage: 'one-octave' }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
-        const midis = scoreEvents(r.value).map(e => e.pitch!.midi);
+        const midis = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi);
         // ascend C-E-G-C then descend back to C; only one C5 (turning point)
         expect(midis).toEqual([48, 52, 55, 60, 55, 52, 48]);
         expect(midis.filter(m => m === 60)).toHaveLength(1);
@@ -48,7 +49,7 @@ describe('generateArpeggio', () => {
         const r = generateArpeggio({ ...base, degree: 'I', pattern: '1235', coverage: 'one-octave' }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
-        const midis = scoreEvents(r.value).map(e => e.pitch!.midi);
+        const midis = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi);
         expect(midis).toEqual([48, 52, 55, 60]);
     });
 
@@ -56,14 +57,14 @@ describe('generateArpeggio', () => {
         const r = generateArpeggio({ ...base, degree: 'I', pattern: 'up', coverage: 'two-octave' }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
-        const midis = scoreEvents(r.value).map(e => e.pitch!.midi);
+        const midis = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi);
         expect(midis).toEqual([48, 52, 55, 60, 64, 67, 72]);
     });
     it('spells the dominant triad G-B-D in C major', () => {
         const r = generateArpeggio({ ...base, degree: 'V', pattern: 'up', coverage: 'one-octave' }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
-        const pcs = scoreEvents(r.value).map(e => e.pitch!.midi % 12);
+        const pcs = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi % 12);
         expect(pcs).toEqual([7, 11, 2, 7]); // G B D G
     });
 
@@ -71,7 +72,7 @@ describe('generateArpeggio', () => {
         const r = generateArpeggio({ ...base, degree: 'vii0', pattern: 'up', coverage: 'one-octave' }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
-        const pcs = scoreEvents(r.value).map(e => e.pitch!.midi % 12);
+        const pcs = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi % 12);
         expect(pcs).toEqual([11, 2, 5, 11]); // B D F B
     });
 
@@ -101,8 +102,9 @@ describe('generateArpeggio — sequence mode', () => {
         // bar boundaries: each bar starts on a chord root? (not enforced) — but ticks align
         const ev = scoreEvents(r.value);
         expect(validateScore(r.value)).toEqual([]);
-        // 4 beats per bar × 4 bars = 16 notes in quarters mode
+        // Auto meter from a 4-note path (960 ticks): 3/4 wins (remainder 480
-        expect(ev.length).toBe(16);
+        // vs 960 in 4/4) → 6 eighths per bar × 4 bars = 24
+        expect(ev.length).toBe(24);
         // deterministic
         const r2 = generateArpeggio({ ...base, degree: 'I', pattern: 'up', coverage: 'one-octave', bars: 4, progression: 'functional', seed: 7 }, pool);
         expect(r2.ok && JSON.stringify(scoreEvents(r2.value)) === JSON.stringify(ev)).toBe(true);
@@ -116,12 +118,13 @@ describe('generateArpeggio — sequence mode', () => {
         expect(syms).toEqual(['C', 'Dm', 'Em', 'F', 'G', 'Am', 'Bdim']);
     });
 
-    it('eighths rhythm doubles notes per bar', () => {
+    it('eighths fill each bar (always-eighths rhythm)', () => {
-        const r = generateArpeggio({ ...base, degree: 'I', pattern: 'up', coverage: 'one-octave', bars: 2, progression: 'functional', rhythm: 'eighths', seed: 3 }, pool);
+        const r = generateArpeggio({ ...base, degree: 'I', pattern: 'up', coverage: 'one-octave', bars: 2, progression: 'functional', seed: 3 }, pool);
         expect(r.ok).toBe(true);
         if (!r.ok) return;
         const ev = scoreEvents(r.value);
-        expect(ev.length).toBe(16); // 2 bars × 4 beats × 2
+        // Auto meter from a 4-note path: 3/4 → 6 eighths per bar × 2 bars
+        expect(ev.length).toBe(12);
         expect(ev[0].durationTicks).toBe(240);
         expect(validateScore(r.value)).toEqual([]);
     });
@@ -136,3 +139,103 @@ describe('generateArpeggio — sequence mode', () => {
         }
     });
 });
+
+describe('generateArpeggio — always-eighths + custom pattern', () => {
+    it('auto-derives 3/4 for a 4-note path (remainder 480 < 960)', () => {
+        const r = generateArpeggio({ ...base, degree: 'I', pattern: 'up', coverage: 'one-octave' }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        expect(r.value.meter).toEqual({ numerator: 3, denominator: 4 });
+        const ev = scoreEvents(r.value);
+        for (const e of ev.filter(x => x.pitch)) expect(e.durationTicks).toBe(240);
+        // 4 notes fill 960 of the 1440-tick bar; remainder is a 480 rest
+        const rest = ev.find(e => e.pitch === null);
+        expect(rest).toBeDefined();
+        expect(rest!.durationTicks).toBe(480);
+        expect(rest!.startTick).toBe(960);
+    });
+
+    it('auto-derives 4/4 for a 6-note path (remainder 480 < 480? no — 6×240=1440 fits 3/4)', () => {
+        // 1321 figure → 4 notes; use 121321 → 6 notes = 1440 ticks = 3/4 exact
+        const r = generateArpeggio({ ...base, degree: 'I', pattern: '121321', coverage: 'one-octave' }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        expect(r.value.meter).toEqual({ numerator: 3, denominator: 4 });
+        const ev = scoreEvents(r.value).filter(e => e.pitch);
+        expect(ev.length).toBe(6);
+        expect(ev.every(e => e.durationTicks === 240)).toBe(true);
+    });
+
+    it('never stretches the last note (the old 2880-tick crash)', () => {
+        const ev = scoreEvents(
+            (generateArpeggio({ ...base, degree: 'I', pattern: 'updown', coverage: 'two-octave' }, pool) as { ok: true; value: import('../score/model').Score }).value
+        );
+        const RENDERABLE = [120, 240, 360, 480, 720, 960, 1440, 1920];
+        for (const e of ev) expect(RENDERABLE).toContain(e.durationTicks);
+    });
+
+    it('builds a custom pattern from digits (1321 = root-fifth-third-root)', () => {
+        const r = generateArpeggio({ ...base, degree: 'I', pattern: 'custom', customPattern: '1321', coverage: 'one-octave' }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        const midis = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi);
+        expect(midis).toEqual([48, 55, 52, 48]); // C G E C
+    });
+
+    it('digit 5 reaches the fifth above the octave', () => {
+        const r = generateArpeggio({ ...base, degree: 'I', pattern: 'custom', customPattern: '15', coverage: 'one-octave' }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        const midis = scoreEvents(r.value).filter(e => e.pitch).map(e => e.pitch!.midi);
+        expect(midis).toEqual([48, 67]); // C + G above the octave C
+    });
+
+    it('rejects invalid custom patterns cleanly', () => {
+        const empty = generateArpeggio({ ...base, degree: 'I', pattern: 'custom', coverage: 'one-octave' }, pool);
+        expect(empty.ok).toBe(false);
+        const bad = generateArpeggio({ ...base, degree: 'I', pattern: 'custom', customPattern: '179', coverage: 'one-octave' }, pool);
+        expect(bad.ok).toBe(false);
+    });
+
+    it('random pattern resolves to a valid broken-chord figure per seed', () => {
+        const RENDERABLE = [120, 240, 360, 480, 720, 960, 1440, 1920];
+        const seen = new Set<string>();
+        for (let seed = 0; seed < 30; seed++) {
+            const r = generateArpeggio({ ...base, degree: 'I', pattern: 'random', coverage: 'one-octave', seed }, pool);
+            expect(r.ok).toBe(true);
+            if (!r.ok) continue;
+            for (const e of scoreEvents(r.value)) expect(RENDERABLE).toContain(e.durationTicks);
+            expect(validateScore(r.value)).toEqual([]);
+            // The title reveals the resolved figure label
+            const match = r.value.title.match(/\(([^)]+)\,/);
+            if (match) seen.add(match[1]);
+        }
+        // Across seeds more than one distinct figure should appear
+        expect(seen.size).toBeGreaterThan(1);
+    });
+
+    it('random pattern is deterministic per seed', () => {
+        const a = generateArpeggio({ ...base, degree: 'I', pattern: 'random', coverage: 'two-octave', seed: 42 }, pool);
+        const b = generateArpeggio({ ...base, degree: 'I', pattern: 'random', coverage: 'two-octave', seed: 42 }, pool);
+        expect(JSON.stringify(a)).toBe(JSON.stringify(b));
+    });
+
+    it('sweep: every pattern × degree × coverage produces only renderable ticks', () => {
+        const RENDERABLE = [120, 240, 360, 480, 720, 960, 1440, 1920];
+        const patterns = ['up', 'down', 'updown', '1235', '1321', '1325', '1535', '12353', '121321', '1353', '15453', '132532'] as const;
+        const degrees = ['I', 'ii', 'iii', 'IV', 'V', 'vi', 'vii0'] as const;
+        for (const pattern of patterns) {
+            for (const degree of degrees) {
+                for (const coverage of ['one-octave', 'two-octave'] as const) {
+                    const r = generateArpeggio({ ...base, degree, pattern, coverage }, pool);
+                    expect(r.ok).toBe(true);
+                    if (!r.ok) continue;
+                    const ev = scoreEvents(r.value);
+                    expect(ev.length).toBeGreaterThan(0);
+                    for (const e of ev) expect(RENDERABLE).toContain(e.durationTicks);
+                    expect(validateScore(r.value)).toEqual([]);
+                }
+            }
+        }
+    });
+});

src/music/arpeggioGenerator.ts

@@ -7,6 +7,9 @@
  * (one or two octaves). Chord tones are spelled via the key's degree
  * spelling (same machinery as melody/scale generators), so spelling and
  * validation match the Phrase Mode invariants exactly.
+ *
+ * Arpeggio mode is ALWAYS eighths (240 ticks per note). Meter is auto-derived
+ * from the pattern length — the user no longer picks rhythm or meter.
  */
 import { PPQ, validateScore, type Result, type Score, type ScoreEvent } from '../score/model';
 import { keyFor, type KeyContext, type ModeId } from './scales';
@@ -18,20 +21,19 @@ export type ArpeggioPattern =
     | 'up' | 'down' | 'updown' | '1235'
     // Giuliani-style right-hand figures over one chord (indices into the
     // chord cycle per note; 1=root 2=third 3=fifth 4=octave):
-    | 'giuliani-pim'   // root-third-fifth (p-i-m)
+    | '1321'   // root-fifth-third-root
-    | 'giuliani-pima'  // root-third-fifth-octave (p-i-m-a)
+    | '1325'   // root-fifth-third-octave
-    | 'giuliani-pami'  // root-octave-fifth-third (p-a-m-i)
+    | '1535'   // root-octave-fifth-octave
-    | 'giuliani-mami'  // third-fifth-octave-third (inner-voice feel)
+    | '12353'  // root-third-fifth-octave-fifth
-    | 'giuliani-ami'   // octave-fifth-third (descending from the top)
+    | '121321' // rolling thirds (root-third-root-fifth-third-root)
-    | 'giuliani-pimamim'  // p-i-m-a-m-i (six-note rolling figure)
+    | '1353'   // root-third-fifth-third
-    | 'giuliani-papima'   // p-a-p-i-m-a (bass-skip pattern)
+    | '15453'  // root-octave-fifth-octave-fifth-octave
-    | 'giuliani-amipim'   // a-m-i-p-i-m (tremolo-adjacent)
+    | '132532' // long broken-chord wave
-    | 'giuliani-miamim';  // m-i-a-m-i-m (triple-string figure)
+    | 'custom' // user-defined pattern from customPattern digits
+    | 'random'; // one broken-chord figure, chosen randomly per exercise (seed)
 export type ArpeggioCoverage = 'one-octave' | 'two-octave';
 /** How the chord per bar is chosen in sequence mode. */
 export type ArpeggioProgression = 'random' | 'functional' | 'diatonic-cycle';
-/** Rhythm density for arpeggio sequences. */
-export type ArpeggioRhythm = 'quarters' | 'eighths';
 
 export interface ArpeggioConfig {
     readonly keyTonic: string;
@@ -39,16 +41,17 @@ export interface ArpeggioConfig {
     readonly degree: ArpeggioDegree;
     readonly pattern: ArpeggioPattern;
     readonly coverage: ArpeggioCoverage;
-    readonly meter: { readonly numerator: 3 | 4; readonly denominator: 4 };
     /** Sequence mode: bars > 1 with chord progression selection. */
     readonly bars?: number;
     readonly progression?: ArpeggioProgression;
-    readonly rhythm?: ArpeggioRhythm;
     /** Restrict progression chords to these degrees (empty = all 7).
      *  The first bar always uses `degree` if it is in the selection. */
     readonly chordSelection?: readonly ArpeggioDegree[];
     /** Seed for progression selection (deterministic). */
     readonly seed?: number;
+    /** User-defined custom pattern digits (1-indexed: 1=root, 2=third, 3=fifth,
+     *  4=octave, 5=fifth-above-octave). Only used when pattern === 'custom'. */
+    readonly customPattern?: string;
 }
 
 /** Degree index (0-based) into the scale for each arpeggio degree label. */
@@ -62,34 +65,44 @@ export const ARPEGGIO_DEGREE_LABELS: Record<ArpeggioDegree, string> = {
 
 export const PATTERN_LABELS: Record<ArpeggioPattern, string> = {
     up: 'Up', down: 'Down', updown: 'Up & down', '1235': '1-2-3-5',
-    'giuliani-pim': 'Giuliani p-i-m',
+    '1321': '1-3-2-1',
-    'giuliani-pima': 'Giuliani p-i-m-a',
+    '1325': '1-3-2-5(8)',
-    'giuliani-pami': 'Giuliani p-a-m-i',
+    '1535': '1-5-3-5(8)',
-    'giuliani-mami': 'Giuliani m-a-m-i',
+    '12353': '1-2-3-5-3',
-    'giuliani-ami': 'Giuliani a-m-i',
+    '121321': '1-2-1-3-2-1',
-    'giuliani-pimamim': 'Giuliani p-i-m-a-m-i',
+    '1353': '1-3-5-3',
-    'giuliani-papima': 'Giuliani p-a-p-i-m-a',
+    '15453': '1-5-4-5-3-5',
-    'giuliani-amipim': 'Giuliani a-m-i-p-i-m',
+    '132532': '1-3-2-5-3-2',
-    'giuliani-miamim': 'Giuliani m-i-a-m-i-m',
+    'custom': 'Custom…',
+    'random': 'Random',
 };
 
 /**
- * Giuliani figures: chord-cycle index per note (0=root 1=third 2=fifth
+ * Broken-chord figures — NOTE sequences (not fingerings): the bass takes the
- * 3=octave). Each figure repeats with an octave register shift per
+ * root, the remaining notes ride the upper chord tones.
- * repetition, mirroring the p-i-m-a feel of the 120 right-hand studies.
+ * Indices into the octave cycle [0=root, 1=third, 2=fifth, 3=octave].
  */
-const GIULIANI_FIGURES: Record<string, number[]> = {
+const BROKEN_FIGURES: Record<string, number[]> = {
-    'giuliani-pim': [0, 1, 2],
+    '1321': [0, 2, 1, 0],
-    'giuliani-pima': [0, 1, 2, 3],
+    '1325': [0, 2, 1, 3],
-    'giuliani-pami': [0, 3, 2, 1],
+    '1535': [0, 3, 2, 3],
-    'giuliani-mami': [1, 2, 3, 1],
+    '12353': [0, 1, 2, 3, 2],
-    'giuliani-ami': [3, 2, 1],
+    '121321': [0, 1, 0, 2, 1, 0],
-    'giuliani-pimamim': [0, 1, 2, 3, 2, 1],
+    '1353': [0, 1, 2, 1],
-    'giuliani-papima': [0, 3, 0, 1, 2, 3],
+    '15453': [0, 3, 2, 3, 2, 3],
-    'giuliani-amipim': [3, 2, 1, 0, 1, 2],
+    '132532': [0, 2, 1, 3, 2, 1],
-    'giuliani-miamim': [2, 1, 3, 2, 1, 2],
 };
 
+/**
+ * Renderable note durations — subset of VexFlow duration codes the
+ * PhraseSheetMusic renderer accepts. ALL generated durations MUST be in this
+ * set, otherwise the renderer produces ghost slots and crashes or misaligns.
+ */
+const RENDERABLE_NOTE_TICKS = new Set([120, 240, 360, 480, 720, 960, 1440, 1920]);
+
+/** Descending renderable durations for rest fills (largest first). */
+const REST_FILL_TICKS = [1920, 1440, 960, 720, 480, 240];
+
 /** pc of a spelled degree (step letter + alter). */
 const degreePc = (d: { step: StepLetter; alter: number }): number =>
     (LETTER_PC[STEP_LETTERS.indexOf(d.step)] + d.alter + 144) % 12;
@@ -127,6 +140,29 @@ function spellInKey(key: KeyContext, midi: number): { step: StepLetter; alter: n
     return { step: d.step, alter: d.alter, octave };
 }
 
+/**
+ * Auto-derive a meter (3/4 or 4/4) from the number of eighths in the phrase.
+ * Always returns 3/4 or 4/4 — 6/8 is never used for arpeggios since it can
+ * produce non-renderable tick sizes with some pattern lengths.
+ *
+ * For N notes at 240 ticks each:
+ *   Try 4/4: bars4 = ceil(N*240 / 1920), remainder4 = bars4*1920 - N*240
+ *   Try 3/4: bars3 = ceil(N*240 / 1440), remainder3 = bars3*1440 - N*240
+ *   Pick the one with smaller remainder (fewer bars as tiebreaker).
+ */
+export function autoArpeggioMeter(noteCount: number): { numerator: 4 | 3; denominator: 4 } {
+    const totalTicks = noteCount * 240;
+    const bars4 = Math.ceil(totalTicks / 1920);
+    const remainder4 = bars4 * 1920 - totalTicks;
+    const bars3 = Math.ceil(totalTicks / 1440);
+    const remainder3 = bars3 * 1440 - totalTicks;
+
+    if (remainder3 < remainder4) return { numerator: 3, denominator: 4 };
+    if (remainder4 < remainder3) return { numerator: 4, denominator: 4 };
+    // equal remainders → prefer fewer bars
+    return bars3 <= bars4 ? { numerator: 3, denominator: 4 } : { numerator: 4, denominator: 4 };
+}
+
 /**
  * Build the arpeggio path: chord tones ascending from the lowest available
  * root (degree tone) that allows a full one/two-octave cycle in the pool.
@@ -192,11 +228,11 @@ function buildPath(key: KeyContext, degreeIndex: number, pool: number[], coverag
             return path;
         }
         default: {
-            // Giuliani figure: cycle [root, third, fifth, octave] with the
+            // Broken-chord figure: cycle [root, third, fifth, octave] with the
             // figure selecting cycle positions per note; the octave wraps so
-            // e.g. p-i-m over C-E-G becomes C E G | C' E' G' ... (ascending
+            // e.g. 1321 over C-E-G becomes C G E C' ... (ascending octave
-            // octave register shift every figure repetition).
+            // register shift every figure repetition).
-            const figure = GIULIANI_FIGURES[pattern];
+            const figure = BROKEN_FIGURES[pattern];
             // 4-note cycle per octave: root, third, fifth, octave
             const cycleOct = (oct: number): number[] => [
                 base[0] + 12 * oct, base[1] + 12 * oct, base[2] + 12 * oct, base[0] + 12 * (oct + 1),
@@ -214,6 +250,143 @@ function buildPath(key: KeyContext, degreeIndex: number, pool: number[], coverag
     }
 }
 
+/**
+ * Parse custom pattern digits into cycle indices (0-based).
+ * Digits are 1-indexed: 1=root, 2=third, 3=fifth, 4=octave, 5=fifth-above-octave.
+ * Returns null for empty/invalid input.
+ */
+function parseCustomPattern(digits: string): number[] | null {
+    if (!digits || digits.trim().length === 0) return null;
+    const result: number[] = [];
+    for (const ch of digits.trim()) {
+        const n = parseInt(ch, 10);
+        if (isNaN(n) || n < 1 || n > 5) return null;
+        // Map 1→0 (root), 2→1 (third), 3→2 (fifth), 4→3 (octave), 5→4 (fifth above octave)
+        result.push(n - 1);
+    }
+    return result.length > 0 ? result : null;
+}
+
+/**
+ * Build a custom path from 0-based digit indices using the one-octave cycle
+ * [root, third, fifth, octave] (index 4 = fifth above the octave).
+ */
+function buildCustomPath(
+    base: number[],
+    pattern: number[],
+    octavesWanted: number,
+    pool: number[],
+): number[] | null {
+    const cycleOct = (oct: number): number[] => [
+        base[0] + 12 * oct, base[1] + 12 * oct, base[2] + 12 * oct, base[0] + 12 * (oct + 1),
+    ];
+
+    const path: number[] = [];
+    for (let oct = 0; oct < octavesWanted; oct++) {
+        const c = cycleOct(oct);
+        // Extend the cycle for digit 5: fifth above the octave (+7 semitones).
+        const extended = [...c, c[3] + 7];
+        for (const idx of pattern) {
+            const note = extended[idx];
+            if (note === undefined) continue;
+            if (oct > 0 && !pool.includes(note)) continue;
+            path.push(note);
+        }
+    }
+    return path.length > 0 ? path : null;
+}
+
+/**
+ * Build the path for one chord (degree), honouring built-in patterns and the
+ * user-defined custom pattern. Returns null when the chord cannot be voiced
+ * in the playable pool.
+ */
+function pathForChord(
+    key: KeyContext,
+    degreeIndex: number,
+    pool: number[],
+    coverage: ArpeggioCoverage,
+    pattern: ArpeggioPattern,
+    customDigits: number[] | null,
+): number[] | null {
+    if (pattern === 'custom') {
+        if (!customDigits) return null;
+        const tones = chordTonesInPool(key, degreeIndex, pool);
+        if (tones.length < 3) return null;
+        const rootPc = degreePc(key.degrees[degreeIndex]);
+        const roots = tones.filter(m => ((m % 12) + 12) % 12 === rootPc);
+        const octavesWanted = coverage === 'one-octave' ? 1 : 2;
+        for (const root of roots) {
+            // chord tones >= root within one octave, including the octave
+            const cycle: number[] = [];
+            for (const midi of tones) {
+                if (midi >= root && midi <= root + 12) cycle.push(midi);
+            }
+            if (!cycle.includes(root + 12) && pool.includes(root + 12)) cycle.push(root + 12);
+            cycle.sort((a, b) => a - b);
+            if (cycle.length < 3 || cycle[0] !== root) continue;
+            const p = buildCustomPath(cycle, customDigits, octavesWanted, pool);
+            if (p) return p;
+        }
+        return null;
+    }
+    return buildPath(key, degreeIndex, pool, coverage, pattern);
+}
+
+/**
+ * Emit one eighth-note event with key-aware spelling.
+ * Returns false when the midi note cannot be spelled in this key.
+ */
+function pushNote(
+    events: ScoreEvent[],
+    key: KeyContext,
+    midi: number,
+    startTick: number,
+    id: string,
+): boolean {
+    const spelled = spellInKey(key, midi);
+    if (!spelled) return false;
+    events.push({
+        id,
+        startTick,
+        durationTicks: 240,
+        pitch: { midi, ...spelled },
+    });
+    return true;
+}
+
+/**
+ * Fill the tail of the material (after the last note) with rests built from
+ * RENDERABLE durations only. Splits the gap greedily, largest duration first.
+ */
+function pushRestFill(events: ScoreEvent[], fromTick: number, untilTick: number): void {
+    let cursor = fromTick;
+    while (cursor < untilTick) {
+        const gap = untilTick - cursor;
+        const dur = REST_FILL_TICKS.find(d => d <= gap);
+        if (!dur) break; // gap smaller than an eighth — should not happen
+        events.push({
+            id: `r${events.length}`,
+            startTick: cursor,
+            durationTicks: dur,
+            pitch: null, // rest
+        });
+        cursor += dur;
+    }
+}
+
+/**
+ * Resolve the effective broken-chord figure for this exercise. 'random'
+ * picks one deterministic figure per seed so every auto-continued run gets
+ * a fresh broken-chord pattern while remaining reproducible.
+ */
+function resolveRandomPattern(pattern: ArpeggioPattern, seed: number): ArpeggioPattern {
+    if (pattern !== 'random') return pattern;
+    const figures = Object.keys(BROKEN_FIGURES);
+    const rng = makeRng(seed * 7919 + 13);
+    return figures[Math.floor(rng() * figures.length)] as ArpeggioPattern;
+}
+
 export function generateArpeggio(
     config: ArpeggioConfig,
     eligiblePitches: number[],
@@ -223,14 +396,11 @@ export function generateArpeggio(
     if (pool.length === 0) return { ok: false, error: 'No playable notes in the selected range — widen the note set.' };
 
     const bars = config.bars ?? 1;
-    const pattern = config.pattern;
+    const pattern = resolveRandomPattern(config.pattern, config.seed ?? 0);
     const coverage = config.coverage;
 
     // ---- Chord sequence ----------------------------------------------------
-    // Single-bar mode: the chosen degree for all bars (bars is 1).
-    // Sequence mode: one chord per bar, chosen by progression rule.
     const degreeIndices: number[] = [];
-    // Sequence chord pool: user selection (restricted to it) or all 7.
     const sel = (config.chordSelection ?? []).filter(d => d in DEGREE_INDEX).map(d => DEGREE_INDEX[d as ArpeggioDegree]);
     const pool7 = sel.length > 0 ? Array.from(new Set(sel)).sort((a, b) => a - b) : [0, 1, 2, 3, 4, 5, 6];
     if (bars === 1) {
@@ -240,8 +410,6 @@ export function generateArpeggio(
         const pick = <T,>(arr: T[]): T => arr[Math.floor(rng() * arr.length)];
         for (let b = 0; b < bars; b++) {
             if (b === 0) {
-                // First bar: a random chord FROM THE SELECTION — fixed starts
-                // repeated the exercise identically every time.
                 degreeIndices.push(pool7.includes(DEGREE_INDEX[config.degree]) && rng() < 0.34
                     ? DEGREE_INDEX[config.degree]
                     : pick(pool7));
@@ -249,20 +417,10 @@ export function generateArpeggio(
             }
             const prev = degreeIndices[b - 1];
             if (config.progression === 'diatonic-cycle') {
-                // Next diatonic degree that is also in the selection
                 let next = (prev + 1) % 7;
                 for (let tries = 0; tries < 7 && !pool7.includes(next); tries++) next = (next + 1) % 7;
                 degreeIndices.push(next);
             } else if (config.progression === 'functional') {
-                // Simple tonal function rules (major-oriented; mirrored for
-                // minor by degree relationships below):
-                //   I   -> {IV, V, vi}
-                //   ii  -> {V}
-                //   iii -> {IV, vi}
-                //   IV  -> {I, V}
-                //   V   -> {I, vi}
-                //   vi  -> {ii, IV}
-                //   vii -> {I}
                 const NEXT: Record<number, number[]> = {
                     0: [3, 4, 5],
                     1: [4],
@@ -272,86 +430,85 @@ export function generateArpeggio(
                     5: [1, 3],
                     6: [0],
                 };
-                // functional: honor the selection — filter rule targets by it
                 const targets = (NEXT[prev] ?? [0]).filter(d => pool7.includes(d));
                 degreeIndices.push(pick(targets.length > 0 ? targets : pool7.filter(d => d !== prev)));
             } else {
-                // random: any selected degree, avoid immediate repetition
                 const candidates = pool7.filter(d => d !== prev);
                 degreeIndices.push(pick(candidates.length > 0 ? candidates : pool7));
             }
         }
     }
 
-    // ---- Path per bar: one arpeggio cycle per chord -------------------------
+    // ---- Custom pattern digits (only for pattern === 'custom') --------------
-    const full = config.meter.numerator * PPQ;
+    const customDigits = pattern === 'custom' ? parseCustomPattern(config.customPattern ?? '') : null;
-    const perBarSegments: { path: number[]; degreeIndex: number }[] = [];
+    if (pattern === 'custom' && !customDigits) {
-    for (const di of degreeIndices) {
+        return { ok: false, error: 'Custom pattern is empty or invalid — enter digits like "1321" (1=root, 2=third, 3=fifth, 4=octave).' };
-        const path = buildPath(key, di, pool, coverage, pattern);
-        if (!path || path.length === 0) {
-            return {
-                ok: false,
-                error: 'The arpeggio does not fit the playable range — widen the range (strings/fret window) or pick another degree.',
-            };
-        }
-        perBarSegments.push({ path, degreeIndex: di });
     }
 
-    // ---- Events: fit each segment into one bar ------------------------------
+    // ---- Build the path for the first chord ----------------------------------
-    const rhythm = config.rhythm ?? 'quarters';
+    // All bars share the same pattern, so the path length (and thus meter) is
+    // derived from the first chord's voicing. Sequence mode repeats the path
+    // within each bar, so the meter also derives from the path length itself.
+    const firstPath = pathForChord(key, degreeIndices[0], pool, coverage, pattern, customDigits);
+    if (!firstPath || firstPath.length === 0) {
+        return {
+            ok: false,
+            error: 'The arpeggio does not fit the playable range — widen the range (strings/fret window) or pick another degree.',
+        };
+    }
+    const meter = autoArpeggioMeter(firstPath.length);
+    const notesPerBar = meter.numerator * 2; // 2 eighths per beat
+    const barLength = meter.numerator * PPQ;
+    const noteDur = 240; // always eighths
+
+    // ---- Events: single-chord vs sequence mode --------------------------------
     const events: ScoreEvent[] = [];
     const chordSymbols: (string | null)[] = [];
-    let cursor = 0;
+
-    for (let b = 0; b < bars; b++) {
+    if (bars === 1) {
-        const { path, degreeIndex } = perBarSegments[b];
+        // Single-chord mode: the path plays once; any remaining ticks in the
-        chordSymbols.push(chordNameFor(key, degreeIndex));
+        // final bar(s) become rests (renderable durations only). The path is
-        if (bars === 1) {
+        // NEVER stretched — durations stay at 240 ticks.
-            // Single-bar mode (v1 behavior): whole path, final note extended
+        const barCount = Math.max(1, Math.ceil((firstPath.length * noteDur) / barLength));
-            // to fill the bar — or, when the path overflows one bar, spread
+        chordSymbols.push(chordNameFor(key, degreeIndices[0]));
-            // over the needed bars with the overflow in the last note.
+
-            const barCount = Math.max(1, Math.ceil((path.length * PPQ) / full));
+        let cursor = 0;
-            const totalTicks = barCount * full;
+        for (let slot = 0; slot < firstPath.length; slot++) {
-            const lastDuration = PPQ + (totalTicks - path.length * PPQ);
+            pushNote(events, key, firstPath[slot], cursor, `a0-${slot}`);
-            path.forEach((midi, n) => {
-                const spelled = spellInKey(key, midi);
-                if (!spelled) return;
-                const dur = n === path.length - 1 ? lastDuration : PPQ;
-                events.push({ id: `a${b}-${n}`, startTick: cursor, durationTicks: dur, pitch: { midi, ...spelled } });
-                cursor += dur;
-            });
-            continue;
-        }
-        // Sequence mode: fit the bar exactly. 'quarters': one note per beat,
-        // cycling up/down through the path. 'eighths': two notes per beat.
-        const slots = rhythm === 'quarters' ? 1 : 2;
-        const notesPerBar = config.meter.numerator * slots;
-        const line: number[] = [];
-        let dir = 1;
-        let lastIdx = 0;
-        while (line.length < notesPerBar) {
-            line.push(path[lastIdx]);
-            if (lastIdx + dir < 0 || lastIdx + dir >= path.length) dir = -dir;
-            else lastIdx += dir;
-        }
-        const noteDur = full / notesPerBar;
-        line.forEach((midi, n) => {
-            const spelled = spellInKey(key, midi);
-            if (!spelled) return;
-            events.push({
-                id: `a${b}-${n}`,
-                startTick: cursor,
-                durationTicks: noteDur,
-                pitch: { midi, ...spelled },
-            });
             cursor += noteDur;
-        });
+        }
+        const totalTicks = barCount * barLength;
+        if (cursor < totalTicks) pushRestFill(events, cursor, totalTicks);
+    } else {
+        // Sequence mode: one chord per bar, each bar holds exactly
+        // `notesPerBar` eighths (the path cycles if it is shorter, and is
+        // truncated if longer — with two-octave coverage the auto-derived
+        // meter always gives enough room).
+        let cursor = 0;
+        for (let b = 0; b < bars; b++) {
+            const di = degreeIndices[b];
+            chordSymbols.push(chordNameFor(key, di));
+            const barPath = pathForChord(key, di, pool, coverage, pattern, customDigits);
+            if (!barPath || barPath.length === 0) {
+                return { ok: false, error: `Cannot voice arpeggio for chord ${chordNameFor(key, di)}.` };
+            }
+            for (let n = 0; n < notesPerBar; n++) {
+                pushNote(events, key, barPath[n % barPath.length], cursor, `a${b}-${n}`);
+                cursor += noteDur;
+            }
+        }
+    }
+
+    // ---- Validate all durations are renderable -----------------------------
+    for (const e of events) {
+        if (!RENDERABLE_NOTE_TICKS.has(e.durationTicks)) {
+            return { ok: false, error: `Internal arpeggio error: non-renderable duration ${e.durationTicks} at ${e.id}.` };
+        }
     }
 
     const chordName = `${key.tonic} ${ARPEGGIO_DEGREE_LABELS[config.degree]}`;
-    const patternLabel = PATTERN_LABELS[config.pattern];
+    const patternLabel = PATTERN_LABELS[pattern];
-    // Single-bar paths can overflow into extra bars (updown/two-octave);
+    const totalMeasures = Math.max(1, Math.ceil(events.reduce((s, e) => Math.max(s, e.startTick + e.durationTicks), 0) / barLength));
-    // sequence mode always has exactly `bars` measures.
-    const totalMeasures = bars === 1 ? Math.max(1, Math.ceil((cursor) / full)) : bars;
     const title = bars === 1
         ? `Arpeggio — ${chordName} (${patternLabel}, ${coverage})`
         : `Arpeggio — ${key.tonic}: ${bars} bars (${config.progression ?? 'functional'})`;
@@ -359,12 +516,12 @@ export function generateArpeggio(
         version: 1,
         id: `arpeggio-${config.keyTonic}-${config.keyMode}-${config.degree}-${config.pattern}-${config.coverage}-${bars}b-${config.progression ?? 'single'}-${config.seed ?? 0}`,
         title,
-        meter: config.meter,
+        meter,
         key: { tonic: config.keyTonic, mode: config.keyMode, signature: key.signature },
         measures: Array.from({ length: totalMeasures }, (_, i) => ({
             number: i + 1,
-            startTick: i * full,
+            startTick: i * barLength,
-            durationTicks: full,
+            durationTicks: barLength,
         })),
         chordSymbols: bars === 1
             // repeat the single chord symbol across the overflow bars
@@ -375,4 +532,4 @@ export function generateArpeggio(
     const problems = validateScore(score);
     if (problems.length > 0) return { ok: false, error: `Internal arpeggio error: ${problems[0]}` };
     return { ok: true, value: score };
-}
+}

src/music/giulianiGenerator.test.ts

@@ -0,0 +1,156 @@
+import { describe, it, expect } from 'vitest';
+import { generateGiulianiStudy, type GiulianiPattern } from './giulianiGenerator';
+import { scoreEvents, validateScore } from '../score/model';
+
+const strings = [40, 45, 50, 55, 59, 64];
+const pool: number[] = [];
+for (const open of strings) for (let f = 0; f <= 12; f++) pool.push(open + f);
+
+const base = {
+    keyTonic: 'C',
+    keyMode: 'major' as const,
+    tuningId: 'standard',
+    bars: 4,
+    chordSelection: [] as string[],
+    allowedStrings: [] as number[],
+};
+
+describe('generateGiulianiStudy', () => {
+    it('generates a 4-bar p-i-m-a study in C major', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 5 }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        const ev = scoreEvents(r.value);
+        expect(r.value.measures.length).toBe(4);
+        // 4 voices → 4/4 auto-derived; eighths: 8 notes per bar
+        expect(ev.length).toBe(4 * 8);
+        expect(validateScore(r.value)).toEqual([]);
+        expect(r.value.title).toContain('Giuliani');
+    });
+
+    it('keeps figure notes on distinct strings per repetition (voicing rule)', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 3 }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        // For each repetition of 4 consecutive notes, all midis must differ
+        // (distinct cycle positions → distinct pitches within a beat figure)
+        const ev = scoreEvents(r.value).filter(e => e.pitch);
+        for (let i = 0; i + 3 < ev.length; i += 4) {
+            const four = ev.slice(i, i + 4).map(e => e.pitch!.midi);
+            expect(new Set(four).size).toBe(4);
+        }
+    });
+
+    it('six-note figures work (pimamim)', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pimamim', seed: 1 }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        const ev = scoreEvents(r.value).filter(e => e.pitch);
+        // 6 voices → 3/4 auto-derived; eighths: 6 notes per bar (one cycle)
+        expect(ev.length).toBe(4 * 6);
+        expect(ev.every(e => e.durationTicks === 240)).toBe(true);
+        expect(validateScore(r.value)).toEqual([]);
+    });
+
+    it('is deterministic per seed', () => {
+        const a = generateGiulianiStudy({ ...base, pattern: 'pim', seed: 9 }, pool);
+        const b = generateGiulianiStudy({ ...base, pattern: 'pim', seed: 9 }, pool);
+        expect(JSON.stringify(a) === JSON.stringify(b)).toBe(true);
+    });
+
+    it('honors string restrictions (fails cleanly when impossible)', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 2, allowedStrings: [0] }, pool);
+        expect(r.ok).toBe(false); // 4 voices cannot live on one string
+    });
+});
+
+describe('generateGiulianiStudy — always-eighths + new patterns', () => {
+    it('all note durations are exactly 240 across every pattern', () => {
+        const patterns = ['pim', 'pima', 'pami', 'aim', 'pimamim', 'pmamim', 'piai', 'pmami', 'pimami', 'pimaia', 'pimai', 'pmia', 'pmim'] as const;
+        for (const p of patterns) {
+            const r = generateGiulianiStudy({ ...base, pattern: p, seed: 1 }, pool);
+            expect(r.ok).toBe(true);
+            if (!r.ok) continue;
+            const ev = scoreEvents(r.value);
+            const RENDERABLE = [120, 240, 360, 480, 720, 960, 1440, 1920];
+            for (const e of ev.filter(x => x.pitch)) expect(e.durationTicks).toBe(240);
+            for (const e of ev.filter(x => x.pitch === null)) expect(RENDERABLE).toContain(e.durationTicks);
+            expect(validateScore(r.value)).toEqual([]);
+        }
+    });
+
+    it('alternating bass puts the fifth degree in the bass on even bars', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 4, bars: 4, alternateBass: true }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        const ev = scoreEvents(r.value).filter(e => e.pitch);
+        const full = 4 * 480; // 4/4 bar
+        // Even bars (0-indexed): first note of each figure cycle is the bass.
+        // Its pc must be the FIFTH of the bar's chord (C major: cycle starts
+        // on I or another diatonic chord; verify bass ≠ root and bass = fifth).
+        for (let bar = 0; bar < 4; bar += 2) {
+            const barEv = ev.filter(e => e.startTick >= bar * full && e.startTick < (bar + 1) * full);
+            expect(barEv.length).toBeGreaterThan(0);
+            const bassMidi = barEv[0].pitch!.midi;
+            const upperPcs = new Set(barEv.slice(1).map(e => e.pitch!.midi % 12));
+            // the bass pc must NOT equal any upper-voice root pc check below;
+            // direct check: bass pc differs from the plain-root voicing
+            const plain = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 4, bars: 4 }, pool);
+            expect(plain.ok).toBe(true);
+            if (!plain.ok) return;
+            const plainEv = scoreEvents(plain.value).filter(e => e.pitch);
+            const plainBass = plainEv.filter(e => e.startTick >= bar * full && e.startTick < (bar + 1) * full)[0];
+            expect(bassMidi % 12).not.toBe(plainBass.pitch!.midi % 12);
+            // and it must be a fifth above the root (7 semitones) — i.e. a
+            // chord tone that is neither root nor third of the upper cycle
+            const bassPc = bassMidi % 12;
+            const rootPc = plainBass.pitch!.midi % 12;
+            // fifth of a diatonic triad: +7 semitones (+6 for the dim chord)
+            expect([6, 7]).toContain((bassPc - rootPc + 12) % 12);
+            void upperPcs;
+        }
+    });
+
+    it('odd bars keep the root bass when alternating is on', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 4, bars: 4, alternateBass: true }, pool);
+        const plain = generateGiulianiStudy({ ...base, pattern: 'pima', seed: 4, bars: 4 }, pool);
+        expect(r.ok && plain.ok).toBe(true);
+        if (!r.ok || !plain.ok) return;
+        const ev = scoreEvents(r.value).filter(e => e.pitch);
+        const plainEv = scoreEvents(plain.value).filter(e => e.pitch);
+        const full = 4 * 480;
+        for (let bar = 1; bar < 4; bar += 2) {
+            const bass = ev.filter(e => e.startTick >= bar * full && e.startTick < (bar + 1) * full)[0];
+            const plainBass = plainEv.filter(e => e.startTick >= bar * full && e.startTick < (bar + 1) * full)[0];
+            expect(bass.pitch!.midi % 12).toBe(plainBass.pitch!.midi % 12);
+        }
+    });
+
+    it('new figure lengths auto-derive the specified meter', () => {
+        const cases: [GiulianiPattern, 3 | 4][] = [
+            ['pim', 3], ['pima', 4], ['pimamim', 3], ['pimai', 4], ['pmia', 4], ['pmim', 4],
+        ];
+        for (const [p, num] of cases) {
+            const r = generateGiulianiStudy({ ...base, pattern: p, seed: 2 }, pool);
+            expect(r.ok).toBe(true);
+            if (!r.ok) continue;
+            expect(r.value.meter.numerator).toBe(num);
+            expect(r.value.meter.denominator).toBe(4);
+        }
+    });
+
+    it('5-voice figures (pimai) fill 4/4 with a trailing 720-tick rest', () => {
+        const r = generateGiulianiStudy({ ...base, pattern: 'pimai', seed: 2, bars: 2 }, pool);
+        expect(r.ok).toBe(true);
+        if (!r.ok) return;
+        const ev = scoreEvents(r.value);
+        const full = 1920;
+        for (let bar = 0; bar < 2; bar++) {
+            const barEv = ev.filter(e => e.startTick >= bar * full && e.startTick < (bar + 1) * full);
+            const rest = barEv.find(e => e.pitch === null);
+            expect(rest).toBeDefined();
+            expect(rest!.startTick).toBe(bar * full + 1200);
+            expect(rest!.durationTicks).toBe(720);
+        }
+    });
+});

src/music/giulianiGenerator.ts

@@ -0,0 +1,326 @@
+/**
+ * Giuliani study generator (Phrase Mode material) — its own category
+ * because the figures require a REAL guitar voicing: the thumb takes the
+ * bass (root on a lower string) and i/m/a ride higher strings. A figure is
+ * only playable when each consecutive voice slot maps to a distinct string
+ * with a valid fret in the playable pool — arbitrary chord arpeggios cannot
+ * guarantee that.
+ *
+ * Voicing search: for a figure of voice-count V, pick a bass string (for
+ * the root) and V-1 higher strings; each note of the cycle is placed on its
+ * designated string at the fret matching the chord tone. Figure repeats
+ * over the chord; every bar re-voices (deterministically) so sequences work.
+ *
+ * Rhythm is ALWAYS eighths (240 ticks per note); meter is auto-derived from
+ * the figure length, so odd figure lengths never produce non-renderable
+ * durations.
+ */
+import { PPQ, validateScore, type Result, type Score, type ScoreEvent, STEP_LETTERS, LETTER_PC, type StepLetter } from '../score/model';
+import { keyFor, type KeyContext, type ModeId } from './scales';
+import { TUNINGS, type Tuning } from '../music/Tunings';
+import { makeRng } from './melodyGenerator';
+
+export type GiulianiPattern =
+    | 'pim'      // Studies 1–20 feel: bass + two upper voices
+    | 'pima'     // Studies 21–40: bass + three upper voices
+    | 'pami'     // bass + descending upper voices
+    | 'aim'      // upper voices first
+    | 'pimamim'  // six-note rolling
+    | 'pmamim'   // asymmetric
+    | 'piai'     // bass + octave-third (wide spacing)
+    | 'pmami'    // bass + fifth-octave-third
+    | 'pimami'   // bass-third-fifth-octave-third-fifth (waltz-like)
+    | 'pimaia'   // bass with two upper-voice pairs
+    | 'pimai'    // p-i-m-a-i
+    | 'pmia'     // p-m-i-a
+    | 'pmim';    // p-m-i-m
+
+export const GIULIANI_PATTERN_LABELS: Record<GiulianiPattern, string> = {
+    pim: 'p-i-m (3 voices)',
+    pima: 'p-i-m-a (4 voices)',
+    pami: 'p-a-m-i',
+    aim: 'a-i-m',
+    pimamim: 'p-i-m-a-m-i',
+    pmamim: 'p-m-a-m-i-m',
+    piai: 'p-i-a-i (wide)',
+    pmami: 'p-m-a-m-i',
+    pimami: 'p-i-m-a-m-i (waltz)',
+    pimaia: 'p-i-m-a-i-a',
+    pimai: 'p-i-m-a-i',
+    pmia: 'p-m-i-a',
+    pmim: 'p-m-i-m',
+};
+
+/** Figure voice slots per repetition (indices into the cycle [root, third, fifth, octave]). */
+const FIGURES: Record<GiulianiPattern, number[]> = {
+    pim: [0, 1, 2],
+    pima: [0, 1, 2, 3],
+    pami: [0, 3, 2, 1],
+    aim: [0, 3, 1],
+    pimamim: [0, 1, 2, 3, 2, 1],
+    pmamim: [0, 2, 3, 2, 1, 2],
+    piai: [0, 1, 3, 1],
+    pmami: [0, 2, 3, 2, 1],
+    pimami: [0, 1, 2, 3, 2, 1],
+    pimaia: [0, 1, 2, 3, 1, 3],
+    pimai: [0, 1, 2, 3, 1],
+    pmia: [0, 2, 1, 3],
+    pmim: [0, 2, 1, 2],
+};
+
+export interface GiulianiConfig {
+    readonly keyTonic: string;
+    readonly keyMode: ModeId;
+    readonly pattern: GiulianiPattern;
+    readonly tuningId: string;
+    /** Bars (one chord per bar). */
+    readonly bars: number;
+    /** Chord degrees allowed (empty = all 7). */
+    readonly chordSelection: readonly string[];
+    /** Seed for chord sequence + voicing choices. */
+    readonly seed: number;
+    /** Deterministic pattern from the practice filter (strings restriction). */
+    readonly allowedStrings: readonly number[];
+    /** Alternating bass: even bars (0-indexed) take the fifth degree as the
+     *  bass note instead of the root. Upper voices stay on chord tones. */
+    readonly alternateBass?: boolean;
+}
+
+const DEGREE_INDEX: Record<string, number> = { I: 0, ii: 1, iii: 2, IV: 3, V: 4, vi: 5, 'vii0': 6 };
+
+const degreePc = (d: { step: StepLetter; alter: number }): number =>
+    (LETTER_PC[STEP_LETTERS.indexOf(d.step)] + d.alter + 144) % 12;
+
+function chordNameFor(key: KeyContext, degreeIndex: number): string {
+    const d = key.degrees[degreeIndex];
+    const third = key.degrees[(degreeIndex + 2) % 7];
+    const fifth = key.degrees[(degreeIndex + 4) % 7];
+    const root = d.step + (d.alter < 0 ? 'b'.repeat(-d.alter) : '#'.repeat(d.alter));
+    const thirdInterval = (degreePc(third) - degreePc(d) + 12) % 12;
+    const fifthInterval = (degreePc(fifth) - degreePc(d) + 12) % 12;
+    let suffix = '';
+    if (thirdInterval === 3 && fifthInterval === 7) suffix = 'm';
+    else if (thirdInterval === 3 && fifthInterval === 6) suffix = 'dim';
+    return root + suffix;
+}
+
+interface ChordTone { readonly pc: number; readonly step: StepLetter; readonly alter: number }
+
+/** Diatonic triad pcs for a degree, spelled. */
+function triadPcs(key: KeyContext, degreeIndex: number): ChordTone[] {
+    return [0, 2, 4].map(o => key.degrees[(degreeIndex + o) % 7]).map(d => ({
+        pc: degreePc(d), step: d.step, alter: d.alter,
+    }));
+}
+
+/**
+ * Auto-derive meter from the figure length (always eighths):
+ *   3 voices (240×3=720):  3/4 (2 cycles = 1440, perfect fit)
+ *   4 voices (240×4=960):  4/4 (2 cycles = 1920, perfect fit)
+ *   5 voices (240×5=1200): 4/4 (1 cycle + 720 rest)
+ *   6 voices (240×6=1440): 3/4 (1 cycle = 1440, perfect fit)
+ */
+export function autoGiulianiMeter(figureLength: number): { numerator: 3 | 4; denominator: 4 } {
+    switch (figureLength) {
+        case 3: return { numerator: 3, denominator: 4 };
+        case 4: return { numerator: 4, denominator: 4 };
+        case 5: return { numerator: 4, denominator: 4 };
+        case 6: return { numerator: 3, denominator: 4 };
+        default: {
+            // Fall back to the same remainder heuristic as arpeggios.
+            const totalTicks = figureLength * 240;
+            const bars4 = Math.ceil(totalTicks / 1920);
+            const remainder4 = bars4 * 1920 - totalTicks;
+            const bars3 = Math.ceil(totalTicks / 1440);
+            const remainder3 = bars3 * 1440 - totalTicks;
+            if (remainder3 < remainder4) return { numerator: 3, denominator: 4 };
+            if (remainder4 < remainder3) return { numerator: 4, denominator: 4 };
+            return bars3 <= bars4 ? { numerator: 3, denominator: 4 } : { numerator: 4, denominator: 4 };
+        }
+    }
+}
+
+/**
+ * Voice a figure bar: assign each cycle position (root/third/fifth/octave)
+ * to a string with a valid fret, bass string lowest. Returns per-slot
+ * {stringIndex, fret, midi} or null when impossible with the allowed strings.
+ * When `bassOverridePc` is given, the bass (cycle position 0) uses that pitch
+ * class instead of the root (alternating bass).
+ */
+function voiceBar(
+    tuning: Tuning,
+    chord: ChordTone[],
+    pattern: GiulianiPattern,
+    allowedStrings: number[],
+    bassOverridePc?: number,
+): { stringIndex: number; fret: number; midi: number }[] | null {
+    const figure = FIGURES[pattern];
+    const maxVoice = Math.max(...figure) + 1; // e.g. 3 for p-i-m, 4 for p-i-m-a
+    const bassPc = bassOverridePc ?? chord[0].pc;
+
+    // Candidate strings sorted low→high for the bass; upper voices fill above.
+    const strings = tuning.strings.map((open, idx) => ({ open, idx }));
+    const sorted = [...strings].sort((a, b) => a.open - b.open);
+    const usable = sorted.filter(s => allowedStrings.length === 0 || allowedStrings.includes(s.idx));
+
+    // cyclePcs[i] = pitch class of cycle position i (0 = bass, 1..3 = upper
+    // chord tones: third, fifth, octave-of-root).
+    const cyclePcs = [...chord.map(c => c.pc), (chord[0].pc + 12) % 12];
+    if (bassOverridePc !== undefined) cyclePcs[0] = bassOverridePc;
+
+    const bassCandidates = usable.filter(s => {
+        // bass must be able to reach the bass pc within 12 frets
+        for (let fret = 0; fret <= 12; fret++) {
+            if (((s.open + fret) % 12 + 12) % 12 === bassPc) return true;
+        }
+        return false;
+    });
+
+    for (const bass of bassCandidates) {
+        // assign remaining voices to strings above the bass
+        const uppers = usable.filter(s => s.open > bass.open).slice(0, maxVoice - 1);
+        if (uppers.length < maxVoice - 1) continue;
+        // Voice slots: cycle positions 1..maxVoice-1 map to uppers in order
+        const slotStrings: ({ open: number; idx: number } | null)[] = [bass];
+        for (let v = 1; v < maxVoice; v++) slotStrings.push(uppers[v - 1]);
+
+        let ok = true;
+        const placement: { stringIndex: number; fret: number; midi: number }[] = [];
+        const usedFrets = new Set<string>();
+        for (let slot = 0; slot < maxVoice; slot++) {
+            const pc = cyclePcs[slot];
+            const s = slotStrings[slot];
+            if (!s) { ok = false; break; }
+            let found: number | null = null;
+            for (let fret = 0; fret <= 12; fret++) {
+                if ((((s.open + fret) % 12) + 12) % 12 === pc) { found = fret; break; }
+            }
+            if (found === null) { ok = false; break; }
+            const midi = s.open + found;
+            const key = `${slot}:${found}`;
+            if (usedFrets.has(key)) { ok = false; break; } // same string double-stop — not for these studies
+            usedFrets.add(key);
+            placement.push({ stringIndex: s.idx, fret: found, midi });
+        }
+        if (ok) return placement;
+    }
+    return null;
+}
+
+export function generateGiulianiStudy(
+    config: GiulianiConfig,
+    eligiblePitches: number[],
+): Result<Score> {
+    const tuning = TUNINGS[config.tuningId];
+    if (!tuning) return { ok: false, error: 'No tuning available for Giuliani studies — pick a fretted instrument.' };
+    const key = keyFor(config.keyTonic, config.keyMode);
+
+    const poolSet = new Set(eligiblePitches.filter(m => Number.isInteger(m)));
+    if (poolSet.size === 0) return { ok: false, error: 'No playable notes in the selected range — widen the note set.' };
+
+    const rng = makeRng(config.seed);
+    const pick = <T,>(arr: T[]): T => arr[Math.floor(rng() * arr.length)];
+
+    // Chord sequence: random from selection (no immediate repeats)
+    const sel = (config.chordSelection ?? []).filter(d => d in DEGREE_INDEX);
+    const poolDegrees = (sel.length > 0 ? sel : Object.keys(DEGREE_INDEX)) as string[];
+    const degreeIndices: number[] = [];
+    for (let b = 0; b < config.bars; b++) {
+        const prev = degreeIndices[b - 1];
+        const candidates = poolDegrees
+            .map(d => DEGREE_INDEX[d])
+            .filter(di => di !== prev);
+        degreeIndices.push(pick(candidates.length > 0 ? candidates : poolDegrees.map(d => DEGREE_INDEX[d])));
+    }
+
+    // Voice each bar; drop bars that cannot be voiced (rare with full pool).
+    const figure = FIGURES[config.pattern];
+    // Meter is ALWAYS auto-derived from the figure length; the user no longer
+    // picks a meter for Giuliani studies.
+    const meter = autoGiulianiMeter(figure.length);
+    const full = meter.numerator * PPQ;
+    const events: ScoreEvent[] = [];
+    const chordSymbols: (string | null)[] = [];
+    const usableBars: { degreeIndex: number; placement: ReturnType<typeof voiceBar> }[] = [];
+    for (let b = 0; b < degreeIndices.length; b++) {
+        const di = degreeIndices[b];
+        const chord = triadPcs(key, di);
+        // Alternating bass: even bars (0-indexed) take the fifth degree as
+        // the bass note instead of the root.
+        const bassOverridePc = config.alternateBass && b % 2 === 0
+            ? chord[2].pc
+            : undefined;
+        const placement = voiceBar(tuning, chord, config.pattern, config.allowedStrings as number[], bassOverridePc);
+        if (!placement) continue;
+        usableBars.push({ degreeIndex: di, placement });
+    }
+    if (usableBars.length === 0) {
+        return { ok: false, error: 'No bar could be voiced with the current string selection — allow more strings or a lower fret window.' };
+    }
+
+    // Rhythm: ALWAYS eighths (240 ticks). Each bar holds
+    // `notesPerBar = (bar length / 240)` notes; the figure repeats to fill
+    // the bar. For 3- and 4-voice figures in their derived meter this is a
+    // whole number of repetitions; 5-voice figures in 4/4 leave a 720-tick
+    // rest at the bar end.
+    const notesPerBar = Math.floor((meter.numerator * PPQ) / 240);
+    const fillSlots = Math.floor(notesPerBar / figure.length) * figure.length;
+
+    let cursor = 0;
+    for (let b = 0; b < usableBars.length; b++) {
+        const { degreeIndex, placement } = usableBars[b];
+        if (!placement) continue; // filtered above, but satisfies strict TS
+        chordSymbols.push(chordNameFor(key, degreeIndex));
+        for (let n = 0; n < fillSlots; n++) {
+            const f = n % figure.length;
+            const slot = figure[f];
+            const note = placement[slot];
+            if (!note) continue;
+            // spelling via key degree of this pc
+            const pc = ((note.midi % 12) + 12) % 12;
+            const d = key.degrees.find(deg => degreePc(deg) === pc);
+            if (!d) continue;
+            const octave = (note.midi - pc) / 12 - 1;
+            events.push({
+                id: `g${b}-${n}`,
+                startTick: cursor,
+                durationTicks: 240,
+                pitch: { midi: note.midi, step: d.step, alter: d.alter, octave },
+            });
+            cursor += 240;
+        }
+        // Rest fill for figure lengths that leave a gap (e.g. 5 voices in 4/4:
+        // one cycle = 1200 ticks, remaining 720 = dotted quarter rest).
+        const barStart = b * full;
+        const barEnd = barStart + full;
+        if (cursor < barEnd) {
+            const gap = barEnd - cursor;
+            events.push({
+                id: `gr${b}`,
+                startTick: cursor,
+                durationTicks: gap,
+                pitch: null,
+            });
+            cursor = barEnd;
+        }
+    }
+
+    const totalBars = usableBars.length;
+    const score: Score = {
+        version: 1,
+        id: `giuliani-${config.keyTonic}-${config.keyMode}-${config.pattern}-${config.bars}b-${config.seed}`,
+        title: `Giuliani study — ${key.tonic} ${config.pattern} (${totalBars} bars)`,
+        meter,
+        key: { tonic: config.keyTonic, mode: config.keyMode, signature: key.signature },
+        measures: Array.from({ length: totalBars }, (_, i) => ({
+            number: i + 1,
+            startTick: i * full,
+            durationTicks: full,
+        })),
+        chordSymbols,
+        voices: [{ id: 'melody', events }],
+    };
+    const problems = validateScore(score);
+    if (problems.length > 0) return { ok: false, error: `Internal giuliani error: ${problems[0]}` };
+    return { ok: true, value: score };
+}

src/music/melodyGenerator.ts

@@ -30,7 +30,7 @@ export interface MelodyConfig {
     readonly keyMode: ModeId;
     /** 1..8 */
     readonly bars: number;
-    readonly meter: { readonly numerator: 3 | 4; readonly denominator: 4 };
+    readonly meter: { readonly numerator: 3 | 4 | 6; readonly denominator: 4 };
     /** 1 = Simple (quarters/halves/wholes), 2 = Mixed (+ paired eighths, dotted quarters),
      *  3 = Elaborate (+ sixteenths, sixteenth groups, dotted eighths). */
     readonly rhythmLevel: 1 | 2 | 3;
@@ -65,6 +65,21 @@ const TEMPLATES_4_L3: number[][] = [
     [480, 480, 360, 120, 480],
     [720, 120, 120, 120, 120, 480],
 ];
+// 6/8 templates (6 quarter-ticks = 2880 per bar; 8th-note oriented).
+const TEMPLATES_6_L1: number[][] = [
+    [240, 240, 240, 240, 240, 240, 240, 240, 480, 480],
+    [480, 480, 240, 240, 240, 240, 480, 480],
+    [240, 240, 480, 480, 480, 240, 240, 240, 240],
+    [960, 480, 480, 480, 480],
+    [480, 480, 480, 480, 960],
+    [1440, 480, 480, 480],
+];
+const TEMPLATES_6_L2: number[][] = [
+[480, 480, 120, 120, 120, 120, 240, 240, 480, 480],
+    [120, 120, 120, 120, 480, 480, 240, 240, 240, 240, 240, 240],
+    [480, 240, 240, 480, 240, 240, 240, 240, 240, 240],
+    [480, 240, 240, 480, 240, 240, 240, 240, 240, 240],
+    [480, 240, 240, 480, 240, 240, 240, 240, 240, 240],];
 const TEMPLATES_3_L1: number[][] = [
     [480, 480, 480],
     [960, 480],
@@ -86,11 +101,24 @@ const TEMPLATES_3_L3: number[][] = [
     [120, 120, 120, 120, 120, 120, 120, 120, 480],
 ];
 
-function templatesFor(meter: { numerator: 3 | 4 }, level: 1 | 2 | 3): number[][] {
+function templatesFor(meter: { numerator: 3 | 4 | 6 }, level: 1 | 2 | 3): number[][] {
-    const base = meter.numerator === 4
+    let base: number[][];
-        ? (level === 1 ? TEMPLATES_4_L1 : level === 2 ? [...TEMPLATES_4_L1, ...TEMPLATES_4_L2] : [...TEMPLATES_4_L1, ...TEMPLATES_4_L2, ...TEMPLATES_4_L3])
+    if (meter.numerator === 4) {
-        : (level === 1 ? TEMPLATES_3_L1 : level === 2 ? [...TEMPLATES_3_L1, ...TEMPLATES_3_L2] : [...TEMPLATES_3_L1, ...TEMPLATES_3_L2, ...TEMPLATES_3_L3]);
+        base = level === 1 ? TEMPLATES_4_L1 : level === 2 ? [...TEMPLATES_4_L1, ...TEMPLATES_4_L2] : [...TEMPLATES_4_L1, ...TEMPLATES_4_L2, ...TEMPLATES_4_L3];
-    return base.filter(t => t.reduce((a, b) => a + b, 0) === meter.numerator * PPQ);
+    } else if (meter.numerator === 6) {
+        base = level === 1 ? TEMPLATES_6_L1 : [...TEMPLATES_6_L1, ...TEMPLATES_6_L2];
+    } else {
+        base = level === 1 ? TEMPLATES_3_L1 : level === 2 ? [...TEMPLATES_3_L1, ...TEMPLATES_3_L2] : [...TEMPLATES_3_L1, ...TEMPLATES_3_L2, ...TEMPLATES_3_L3];
+    }
+    const out = base.filter(t => t.reduce((a, b) => a + b, 0) === meter.numerator * PPQ);
+    // Never return an empty pool — fall back to the closest available level
+    // so generator.pick on an empty array can never crash the app.
+    if (out.length === 0) {
+        const all = [...TEMPLATES_4_L1, ...TEMPLATES_4_L2, ...TEMPLATES_3_L1, ...TEMPLATES_3_L2, ...TEMPLATES_6_L1];
+        const anyFit = all.filter(t => t.reduce((a, b) => a + b, 0) === meter.numerator * PPQ);
+        return anyFit.length > 0 ? anyFit : [[meter.numerator * PPQ]];
+    }
+    return out;
 }
 
 /** Motion weights by semitone distance (soft preference, contract C3). */

src/music/scaleDrills.ts

@@ -19,7 +19,7 @@ export interface DrillConfig {
     readonly keyMode: ModeId;
     readonly direction: DrillDirection;
     readonly coverage: DrillCoverage;
-    readonly meter: { readonly numerator: 3 | 4; readonly denominator: 4 };
+    readonly meter: { readonly numerator: 3 | 4 | 6; readonly denominator: 4 };
     /** Note duration: quarters (default) or eighths. */
     readonly rhythm?: DrillRhythm;
 }

src/score/model.ts

@@ -86,7 +86,7 @@ export interface Score {
     readonly version: 1;
     readonly id: string;
     readonly title: string;
-    readonly meter: { readonly numerator: 3 | 4; readonly denominator: 4 };
+    readonly meter: { readonly numerator: 3 | 4 | 6; readonly denominator: 4 };
     readonly key: ScoreKey;
     readonly measures: ScoreMeasure[];
     /** Exactly one voice in v1. */

src/types/SettingsTypes.ts

@@ -42,7 +42,7 @@ export interface RhythmSettings {
     volume: number;
 }
 
-export type PhraseMaterial = 'melody' | 'scale' | 'arpeggio' | 'library' | 'import';
+export type PhraseMaterial = 'melody' | 'scale' | 'arpeggio' | 'giuliani' | 'library' | 'import';
 export type PhrasePace = 'step' | 'tempo';
 
 export interface PhraseSettings {
@@ -52,7 +52,7 @@ export interface PhraseSettings {
     keyTonic: string;
     keyMode: string; // ModeId
     bars: number; // 1–8 (melodies)
-    meterNumerator: 3 | 4;
+    meterNumerator: 3 | 4 | 6;
     rhythmLevel: 1 | 2 | 3;
     scaleCoverage: 'one-octave' | 'two-octave' | 'position';
     scaleDirection: 'up' | 'down' | 'updown';
@@ -61,12 +61,14 @@ export interface PhraseSettings {
     arpeggioDegree: string; // ArpeggioDegree (single-chord mode / sequence start)
     /** Sequence mode: which degrees may appear (empty = all 7). */
     arpeggioChordSelection: string[];
-    arpeggioPattern: 'up' | 'down' | 'updown' | '1235';
+    arpeggioPattern: 'up' | 'down' | 'updown' | '1235' | 'custom' | 'random';
     arpeggioCoverage: 'one-octave' | 'two-octave';
     /** Sequence mode: bars per exercise (1 = single chord). */
     arpeggioBars: number;
     arpeggioProgression: 'random' | 'functional' | 'diatonic-cycle';
-    arpeggioRhythm: 'quarters' | 'eighths';
+    /** Giuliani study material (own category — voicing-enforced). */
+    giulianiPattern: 'pim' | 'pima' | 'pami' | 'aim' | 'pimamim' | 'pmamim' | 'piai' | 'pmami' | 'pimami' | 'pimaia' | 'pimai' | 'pmia' | 'pmim';
+    giulianiBars: number;
     /** Phrase-local fret window (guitar/bass) — overrides the note set. */
     fretWindowEnabled: boolean;
     fretMin: number;
@@ -84,6 +86,10 @@ export interface PhraseSettings {
     /** Begin the run as soon as the first note is played (no count-in,
      *  step pace only). */
     autoStartOnNote: boolean;
+    /** Custom arpeggio pattern as raw digits (1=root, 2=third, etc.). */
+    customArpeggioPattern?: string;
+    /** Alternating bass thumb for Giuliani studies. */
+    giulianiAlternateBass?: boolean;
 }
 
 export const DEFAULT_PHRASE_SETTINGS: PhraseSettings = {
@@ -103,7 +109,8 @@ export const DEFAULT_PHRASE_SETTINGS: PhraseSettings = {
     arpeggioCoverage: 'one-octave',
     arpeggioBars: 1,
     arpeggioProgression: 'functional',
-    arpeggioRhythm: 'quarters',
+    giulianiPattern: 'pima',
+    giulianiBars: 4,
     fretWindowEnabled: false,
     fretMin: 0,
     fretMax: 4,
@@ -115,6 +122,8 @@ export const DEFAULT_PHRASE_SETTINGS: PhraseSettings = {
     autoContinue: true,
     inputMode: 'mic',
     autoStartOnNote: false,
+    customArpeggioPattern: '',
+    giulianiAlternateBass: false,
 };
 
 export function getPhraseSettings(s: AppSettings): PhraseSettings {