Assist: drop flickering hint paragraph; center tuner in its frame

The 'Play a note' paragraph toggled with every detection gap and shifted
the layout — removed (incl. unused .assist-hint rule). TuningMeter is a
fixed-width 260px block; the tuner tool's body row now centers it.

TOOLS_LOCAL.md

@@ -1,5 +1,7 @@
-# Local deployment (nyx server) — beta channel
+# Local deployment (nyx server) — beta channel (tracks main = production state by default)
-- Managed by Nyx; deploy script: `~/deploy/smt-beta.sh [branch]` (fetch, build, docker rebuild, restart)
+- Managed by Nyx; deploy script: `~/deploy/smt-beta.sh [branch]` (fetch, build, docker rebuild, restart; **default branch: main**)
-- Container: `smt-beta` (nginx:alpine, 127.0.0.1:8081), image `smt-beta-image`
+- Container: `smt-beta` (nginx:alpine, 127.0.0.1:8081 **and** tailnet IP 100.64.0.4:8081), image `smt-beta-image`
-- Tailnet URL: http://nyx-rg3jpx6w.internal.0jm.de/ (tailscale serve → 8081)
+- Tailnet URLs:
+  - http://nyx-rg3jpx6w.internal.0jm.de/ (tailscale serve → 8081; needs MagicDNS; Chrome history may autocomplete a broken https:// variant — delete it from history)
+  - **http://100.64.0.4:8081/ (preferred: Chrome never HTTPS-upgrades IP:port URLs, no MagicDNS needed)**
 - Note: `tailscale serve --https` not available on this tailnet (feature not enabled); plain HTTP inside tailnet only

src/App.css

@@ -1041,29 +1041,53 @@ button {
 
 .phrase-setup {
     margin-bottom: 16px;
-    border-bottom: 1px solid color-mix(in srgb, var(--color-text-main) 12%, transparent);
+    border: 1px solid color-mix(in srgb, var(--color-text-main) 18%, transparent);
-    padding-bottom: 12px;
+    border-radius: 10px;
+    background: color-mix(in srgb, var(--color-text-main) 4%, transparent);
 }
 
 .phrase-setup summary {
     display: flex;
     align-items: center;
-    gap: 6px;
+    gap: 8px;
     cursor: pointer;
-    font-size: 13px;
+    font-size: 15px;
-    color: var(--color-text-muted);
+    font-weight: 600;
+    color: var(--color-text-main);
+    padding: 12px 14px;
     user-select: none;
+    list-style: none;
+    border-radius: 10px;
+    transition: background 0.15s ease;
+}
+
+/* Hide the default disclosure triangle — the chevron icon does the job */
+.phrase-setup summary::-webkit-details-marker {
+    display: none;
 }
 
 .phrase-setup summary:hover {
-    color: var(--color-text-main);
+    background: color-mix(in srgb, var(--color-text-main) 7%, transparent);
+}
+
+.phrase-setup[open] summary {
+    border-bottom: 1px solid color-mix(in srgb, var(--color-text-main) 12%, transparent);
+    border-radius: 10px 10px 0 0;
+}
+
+.phrase-setup summary svg {
+    transition: transform 0.15s ease;
+}
+
+.phrase-setup[open] summary svg {
+    transform: rotate(180deg);
 }
 
 .phrase-setup-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
     gap: 10px 14px;
-    margin-top: 12px;
+    padding: 12px 14px 14px;
 }
 
 .phrase-setup-grid label {
@@ -1166,9 +1190,36 @@ button {
   overflow-x: auto;
 }
 
-.assist-hint {
+/* ---- Transport step group (preview stepping) ---------------------------- */
+.transport-step-group {
+  display: flex;
+  gap: 6px;
+}
+
+.step-button {
+  padding: 0.4rem 0.55rem;
+}
+
+/* ---- Display toggles (virtual instrument / hint show-hide) -------------- */
+/* Separate row of pure show/hide switches, styled like the tuner and
+   metronome switches — visually distinct from transport actions. */
+.display-toggles {
+  display: flex;
+  justify-content: center;
+  gap: var(--spacing-lg);
+  margin-top: 10px;
+}
+
+.display-toggle {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.display-toggle-label {
+  display: flex;
+  align-items: center;
+  gap: 5px;
   font-size: 12px;
   color: var(--color-text-muted);
-  margin: 0;
-  text-align: center;
 }

src/App.tsx

@@ -165,6 +165,12 @@ function App() {
           case 'n':
             phraseRef.current?.next();
             break;
+          case 'arrowleft':
+            phraseRef.current?.previewStep(-1);
+            break;
+          case 'arrowright':
+            phraseRef.current?.previewStep(1);
+            break;
           case 's':
             phraseRef.current?.skip();
             break;
@@ -271,11 +277,19 @@ function App() {
 
           <div className="header-controls">
             <div className="game-mode-toggle">
+              <button
+                className={`toggle-option ${settings.gameMode === 'assist' ? 'active' : ''}`}
+                onClick={() => setSettings(s => ({ ...s, gameMode: 'assist' }))}
+                title="Practice companion: shows played notes while you work from paper"
+              >
+                Assist
+              </button>
               <button
                 className={`toggle-option ${settings.gameMode === 'sight_reading' ? 'active' : ''}`}
                 onClick={() => setSettings(s => ({ ...s, gameMode: 'sight_reading' }))}
+                title="Learn to read notes from the staff"
               >
-                Sight Reading
+                Learn Notes
               </button>
               <button
                 className={`toggle-option ${settings.gameMode === 'ear_training' ? 'active' : ''}`}
@@ -290,13 +304,6 @@ function App() {
               >
                 Phrases
               </button>
-              <button
-                className={`toggle-option ${settings.gameMode === 'assist' ? 'active' : ''}`}
-                onClick={() => setSettings(s => ({ ...s, gameMode: 'assist' }))}
-                title="Practice companion: shows played notes while you work from paper"
-              >
-                Assist
-              </button>
             </div>
 
             <button
@@ -367,13 +374,17 @@ function App() {
                 {listening ? <Mic size={28} /> : <MicOff size={28} />}
               </button>
 
-              <LiveNoteStaff
+              {/* Live staff omitted in Assist mode: the Assist card already
-                midi={displayedPitch ? displayedPitch.midi : null}
+                  shows the played note large above the fretboard. */}
-                transpose={resolveClefTranspose(currentInstrumentDef, settings.difficulty).transpose}
+              {!isAssist && (
-                keySignature={settings.keySignature}
+                <LiveNoteStaff
-                clef={currentInstrumentDef.clefMode === 'treble' ? 'treble' : currentInstrumentDef.clefMode === 'bass' ? 'bass' : undefined}
+                  midi={displayedPitch ? displayedPitch.midi : null}
-                theme={settings.theme}
+                  transpose={resolveClefTranspose(currentInstrumentDef, settings.difficulty).transpose}
-              />
+                  keySignature={settings.keySignature}
+                  clef={currentInstrumentDef.clefMode === 'treble' ? 'treble' : currentInstrumentDef.clefMode === 'bass' ? 'bass' : undefined}
+                  theme={settings.theme}
+                />
+              )}
               <div className={`pitch-readout ${displayedPitch ? 'active' : ''}`}>
                 {displayedPitch ? (
                   <>
@@ -430,6 +441,7 @@ function App() {
                 <>
                   <div className="help-item"><span>Start / Pause / Resume</span><span className="shortcut-key">Space</span></div>
                   <div className="help-item"><span>Preview phrase (Play / Stop)</span><span className="shortcut-key">P</span></div>
+                  <div className="help-item"><span>While previewing: step note forward / back</span><span className="shortcut-key">→ / ←</span></div>
                   <div className="help-item"><span>Retry phrase</span><span className="shortcut-key">R</span></div>
                   <div className="help-item"><span>New melody / next bars</span><span className="shortcut-key">N</span></div>
                   <div className="help-item"><span>Skip note (at your pace)</span><span className="shortcut-key">S</span></div>

src/components/AssistMode.tsx

@@ -30,6 +30,10 @@ export const AssistMode: React.FC<AssistModeProps> = ({ pitchData, windowWidth }
     const fretted = isFrettedInstrument(settings.instrument) && !!currentTuning;
     const pf = getPracticeFilter(settings);
 
+    const { clef, transpose } = useMemo(() =>
+        resolveClefTranspose(currentInstrumentDef, settings.difficulty),
+    [currentInstrumentDef, settings.difficulty]);
+
     // Alternative positions for the detected note (respect fret window filter)
     const positions = useMemo(() => {
         if (!fretted || !currentTuning || !pitchData) return [];
@@ -38,9 +42,23 @@ export const AssistMode: React.FC<AssistModeProps> = ({ pitchData, windowWidth }
         return all.filter(p => p.fret >= Math.max(0, pf.fretMin) && p.fret <= Math.min(24, pf.fretMax));
     }, [fretted, currentTuning, pitchData, pf.fretWindowEnabled, pf.fretMin, pf.fretMax]);
 
-    const { clef, transpose } = useMemo(() =>
+    // Full written range of the currently configured pool (strings × frets,
-        resolveClefTranspose(currentInstrumentDef, settings.difficulty),
+    // respecting the same filter as the position markers). The staff box is
-    [currentInstrumentDef, settings.difficulty]);
+    // sized to fit it, so notes render at their TRUE written position with
+    // real ledger lines — no 8va/8vb octave shifting.
+    const range = useMemo(() => {
+        if (!fretted || !currentTuning) return undefined;
+        const strings = pf.strings.length > 0
+            ? currentTuning.strings.filter((_, i) => pf.strings.includes(i))
+            : currentTuning.strings;
+        if (strings.length === 0) return undefined;
+        const lo = pf.fretWindowEnabled ? Math.max(0, pf.fretMin) : 0;
+        const hi = pf.fretWindowEnabled ? Math.min(24, pf.fretMax) : 24;
+        return {
+            min: Math.min(...strings) + lo + transpose,
+            max: Math.max(...strings) + hi + transpose,
+        };
+    }, [fretted, currentTuning, pf.strings, pf.fretWindowEnabled, pf.fretMin, pf.fretMax, transpose]);
 
     const staffWidth = Math.min(windowWidth - 40, 860);
 
@@ -61,6 +79,8 @@ export const AssistMode: React.FC<AssistModeProps> = ({ pitchData, windowWidth }
                     keySignature={settings.keySignature}
                     clef={clef === 'grand' ? undefined : clef}
                     width={Math.min(240, staffWidth)}
+                    height={88}
+                    range={range}
                     theme={settings.theme}
                 />
             </div>
@@ -71,19 +91,12 @@ export const AssistMode: React.FC<AssistModeProps> = ({ pitchData, windowWidth }
                         tuning={currentTuning}
                         positions={positions}
                         maxFrets={15}
-                        showHints={false}
+                        showHints={true}
                         interactive={false}
                         displayTranspose={transpose}
                     />
                 </div>
             )}
-
-            {!pitchData && (
-                <p className="assist-hint">
-                    Play a note — it shows here. Mic is{' '}
-                    {settings.showTuningMeter ? 'on' : 'controlled by the mic button below'}.
-                </p>
-            )}
         </div>
     );
 };

src/components/Controls.tsx

@@ -68,8 +68,8 @@ export const Controls: React.FC<ControlsProps> = ({ currentPitch }) => {
             )}
             {shouldShowFilters && <TargetNoteControls />}
 
-            {/* Bottom Section: Tools Grid (2 Columns now) */}
+            {/* Bottom Section: Tools Grid (stacked in all modes) */}
-            <div className="tools-grid" style={inPhraseMode ? { gridTemplateColumns: '1fr' } : undefined}>
+            <div className="tools-grid" style={{ gridTemplateColumns: '1fr' }}>
                 {/* Tool 1: Tuner */}
                 <div style={{ display: 'flex', flexDirection: 'column', gap: '8px', border: '1px solid rgba(128,128,128,0.2)', padding: '12px', borderRadius: '8px' }}>
                     <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
@@ -86,7 +86,7 @@ export const Controls: React.FC<ControlsProps> = ({ currentPitch }) => {
                         </button>
                     </div>
                     {settings.showTuningMeter && (
-                        <div style={{ paddingTop: '8px', borderTop: '1px solid color-mix(in srgb, var(--color-text-main) 10%, transparent)' }}>
+                        <div style={{ paddingTop: '8px', borderTop: '1px solid color-mix(in srgb, var(--color-text-main) 10%, transparent)', display: 'flex', justifyContent: 'center' }}>
                             <TuningMeter
                                 cents={currentPitch ? currentPitch.cents : null}
                                 noteName={currentPitch ? currentPitch.note : null}

src/components/LiveNoteStaff.tsx

@@ -21,14 +21,45 @@ interface LiveNoteStaffProps {
      *  clef auto-switches treble/bass around middle C (piano-style). */
     clef?: 'treble' | 'bass';
     width?: number;
+    /** Box height. 64px matches the mic bar; larger boxes (e.g. 88px in
+     *  Assist mode) give ledger lines room inside instead of being clipped
+     *  by the parent's overflow: hidden. Ignored when `range` is set. */
+    height?: number;
+    /** Written-pitch range the box must fit WITHOUT octave shifting.
+     *  When set, notes render at their true staff position with real ledger
+     *  lines (no 8va/8vb marker) and the box height is computed from the
+     *  range so every note in it stays inside the box. */
+    range?: { min: number; max: number };
     theme?: 'light' | 'dark' | 'auto';
 }
 
 const BOX_H = 64;   // mic button height — vertical centering via the bar
 // VexFlow draws the first stave line ~40.5px BELOW the constructor y
-// (default space_above_staff_ln = 4 line-spaces). To center a 38px staff in
+// (default space_above_staff_ln = 4 line-spaces). To center the ~38px staff
-// the 64px box the constructor y must be negative.
+// in a box of height h the constructor y must be negative. For h = 64 this
-const STAVE_Y = -28;
+// yields -27.5 ≈ -28 (the original hardcoded value).
+const staveYFor = (h: number) => (h - 38) / 2 - 40.5;
+
+// Diatonic index (C0 = 0, one step per letter name) for ledger-line math.
+const DI_STEP = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
+const diFromMidi = (m: number) => Math.floor(m / 12 - 1) * 7 + DI_STEP[m % 12];
+// Top/bottom staff-line diatonic index per clef (treble F5/E4, bass A3/G2).
+const CLEF_LINES: Record<'treble' | 'bass', { top: number; bottom: number }> = {
+    treble: { top: 38, bottom: 30 },
+    bass: { top: 26, bottom: 18 },
+};
+// One diatonic step = half a staff space = 5px (standard 10px spaces).
+// Box that fits a whole written range: staff anchored below the top
+// headroom so the highest note has room for its ledger lines, lowest note
+// the same at the bottom.
+const rangeLayout = (range: { min: number; max: number }, clef: 'treble' | 'bass') => {
+    const lines = CLEF_LINES[clef];
+    const aboveLines = Math.max(0, Math.ceil((diFromMidi(range.max) - lines.top) / 2));
+    const belowLines = Math.max(0, Math.ceil((lines.bottom - diFromMidi(range.min)) / 2));
+    const abovePx = aboveLines * 10 + 10;   // + notehead margin
+    const belowPx = belowLines * 10 + 10;
+    return { height: abovePx + 38 + belowPx, y: abovePx - 40.5 };
+};
 
 export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
     midi,
@@ -36,9 +67,18 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
     keySignature = 'C',
     clef: clefOverride,
     width = 130,
+    height = BOX_H,
+    range,
     theme = 'auto',
 }) => {
     const containerRef = useRef<HTMLDivElement>(null);
+
+    // Box geometry: range-fit wins over the fixed height prop.
+    const fit = range
+        ? rangeLayout(range, clefOverride ?? 'treble')
+        : { height, y: staveYFor(height) };
+    const boxH = fit.height;
+    const staveY = fit.y;
     const [schemeVersion, setSchemeVersion] = useState(0);
     useEffect(() => {
         const mq = window.matchMedia('(prefers-color-scheme: dark)');
@@ -53,7 +93,7 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
         container.innerHTML = '';
 
         const renderer = new Renderer(container, Renderer.Backends.SVG);
-        renderer.resize(width, BOX_H);
+        renderer.resize(width, boxH);
         const context = renderer.getContext();
 
         const resolvedColor =
@@ -63,7 +103,7 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
         context.setFillStyle(resolvedColor);
         context.setStrokeStyle(resolvedColor);
 
-        const stave = new Stave(0, STAVE_Y, width - 2);
+        const stave = new Stave(0, staveY, width - 2);
         stave.setDefaultLedgerLineStyle({ strokeStyle: resolvedColor, lineWidth: 2 });
         const written0 = midi !== null ? midi + transpose : null;
         // Instrument-fixed clef when provided (guitar always treble, bass
@@ -79,13 +119,17 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
             //   treble: staff E4..F5 (+ up to two ledger lines each way)
             //   bass:   staff G2..A3 (+ up to two ledger lines each way)
             let written = written0!;
+            // Range-fit mode renders the TRUE written position with real
+            // ledger lines — no 8va/8vb shifting.
             let octaveMark: '8va' | '8vb' | null = null;
-            if (clef === 'treble') {
+            if (!range) {
-                while (written < 58) { written += 12; octaveMark = '8vb'; }
+                if (clef === 'treble') {
-                while (written > 81) { written -= 12; octaveMark = '8va'; }
+                    while (written < 58) { written += 12; octaveMark = '8vb'; }
-            } else {
+                    while (written > 81) { written -= 12; octaveMark = '8va'; }
-                while (written < 40) { written += 12; octaveMark = '8vb'; }
+                } else {
-                while (written > 61) { written -= 12; octaveMark = '8va'; }
+                    while (written < 40) { written += 12; octaveMark = '8vb'; }
+                    while (written > 61) { written -= 12; octaveMark = '8va'; }
+                }
             }
 
             const spec = getNoteInKey(written, keySignature);
@@ -113,13 +157,13 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
             new Formatter().joinVoices([voice]).format([voice], width - 40);
             voice.draw(context, stave);
         }
-    }, [midi, transpose, keySignature, clefOverride, width, theme, schemeVersion]);
+    }, [midi, transpose, keySignature, clefOverride, width, boxH, staveY, range, theme, schemeVersion]);
 
     return (
         <div
             ref={containerRef}
             className="live-note-staff"
-            style={{ width, height: BOX_H }}
+            style={{ width, height: boxH }}
             role="img"
             aria-label={midi !== null ? 'Currently played note' : 'No note currently detected'}
         />

src/components/MetronomeWidget.tsx

@@ -55,13 +55,22 @@ export const MetronomeWidget: React.FC<MetronomeWidgetProps> = ({
 
     const isSync = syncMode === 'option' && !!rhythm.syncToExercise;
     const runActive = gate === true;
+    // Phrase mode (syncMode 'option') has no on/off switch — the sync
+    // checkbox replaces it (unchecked = free metronome, checked = synced to
+    // the exercise), so the metronome is always armed there. Gating on
+    // rhythm.active would leave phrase users with no way to enable clicks.
+    const armed = syncMode === 'option' ? true : rhythm.active;
     // Sync: pendulum/click only while the run is active (the run's scheduler
     // is the click source; the widget's own scheduler stays off).
     // Free/plain: the widget's own scheduler runs whenever armed.
-    const running = isSync ? runActive : rhythm.active;
+    const running = isSync ? runActive : armed;
+
+    // Timer mode = one beat per N seconds: effective BPM 60/seconds so
+    // clicks and pendulum match the trainer's auto-advance cadence.
+    const effectiveBpm = rhythm.mode === 'bpm' ? rhythm.bpm : 60 / Math.max(1, rhythm.seconds);
 
     const { restart } = useMetronome({
-        bpm: rhythm.bpm,
+        bpm: effectiveBpm,
         volume: rhythm.sound ? rhythm.volume : 0,
         playing: running && !isSync,
         onTick: handleTick,
@@ -77,8 +86,7 @@ export const MetronomeWidget: React.FC<MetronomeWidgetProps> = ({
         });
     }, [isSync, runActive]);
 
-    const beatMs = 60000 / Math.max(1, rhythm.bpm);
+    const beatMs = 60000 / Math.max(1, effectiveBpm);
-    const armed = rhythm.active;
 
     return (
         <div style={{ display: 'flex', flexDirection: 'column', gap: '8px' }}>

src/components/PhraseTrainer.tsx

@@ -35,11 +35,12 @@ import { TUNINGS, getFretboardPositions } from '../music/Tunings';
 import { INSTRUMENT_DEFINITIONS, resolveClefTranspose } from '../music/InstrumentConfigs';
 const AUTO_CONTINUE_DELAY_MS = 1500;
 
-import { Play, Pause, RotateCcw, SkipForward, Volume2, Square, ChevronDown, Music2, Upload, HelpCircle, Guitar } from 'lucide-react';
+import { Play, Pause, RotateCcw, SkipForward, SkipBack, Volume2, ChevronDown, Music2, Upload, HelpCircle, Guitar } from 'lucide-react';
 
 export interface PhraseHandle {
     pauseToggle: () => void;
     previewToggle: () => void;
+    previewStep: (dir: 1 | -1) => void;
     retry: () => void;
     skip: () => void;
     next: () => void;
@@ -84,13 +85,15 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         const pace: PhraseSettings['pace'] = settings.rhythm.syncToExercise ? 'tempo' : 'step';
         phrase.pace = pace;
         // Click decision — ONE source: the metronome widget's sound checkbox.
-        // - Sync (tempo): run clicks when armed && sound (count-in incl.);
+        // Phrase mode has no metronome on/off switch (the sync checkbox
-        //   widget silent while idle.
+        // replaces it, see MetronomeWidget), so rhythm.active must NOT gate
-        // - Free metronome: widget clicks freely; the run stays silent to
+        // clicks here — with the default active:false a synced run would
-        //   avoid doubling (sync off in tempo = free widget during runs).
+        // stay silent with no way to fix it from this mode.
-        phrase.clickSound = pace === 'tempo'
+        // - Sync (tempo): run clicks when sound is on (count-in included);
-            ? settings.rhythm.active && settings.rhythm.sound
+        //   the widget stays silent while idle.
-            : settings.rhythm.active && settings.rhythm.sound && !settings.rhythm.syncToExercise;
+        // - Free metronome (step): the widget clicks freely; the run stays
+        //   silent to avoid doubling.
+        phrase.clickSound = settings.rhythm.sound;
         const setPhrase = useCallback((updates: Partial<PhraseSettings>) => {
             updateSettings(s => ({ ...s, phrase: { ...getPhraseSettings(s), ...updates } }));
         }, [updateSettings]);
@@ -328,6 +331,7 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         useImperativeHandle(ref, () => ({
             pauseToggle: () => trainer?.pauseToggle(),
             previewToggle: () => trainer?.previewToggle(),
+            previewStep: (dir) => trainer?.previewStep(dir),
             retry: () => trainer?.retry(),
             skip: () => trainer?.skip(),
             pause: () => trainer?.pause(),
@@ -337,8 +341,13 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         // ---- Hints --------------------------------------------------------------
         const activeScore = trainer.activeScore;
         const events = scoreEvents(activeScore);
-        const currentMidi = trainer.currentIdx >= 0 && events[trainer.currentIdx]?.pitch
+        // While previewing, the hint instruments follow the preview cursor so
-            ? events[trainer.currentIdx]!.pitch!.midi
+        // the user can find notes on the fretboard while listening.
+        const displayIdx = trainer.phase === 'preview' || trainer.phase === 'previewPaused'
+            ? trainer.previewIdx
+            : trainer.currentIdx;
+        const currentMidi = displayIdx >= 0 && events[displayIdx]?.pitch
+            ? events[displayIdx]!.pitch!.midi
             : null;
 
         const hintPositions = useMemo(() => {
@@ -368,7 +377,8 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         const statusText = useMemo(() => {
             if (!scoreOk) return materialError ?? 'No material.';
             const p = trainer.phase;
-            if (p === 'preview') return 'Listen …';
+            if (p === 'preview') return 'Listen … (pause to step note by note)';
+            if (p === 'previewPaused') return 'Paused — step with ⏮ ⏭ or ← →, resume with P';
             if (p === 'countIn') return `Count-in: ${trainer.countInLeft}`;
             if (p === 'paused') return 'Paused';
             if (p === 'done') {
@@ -387,12 +397,13 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
             const p = trainer.phase;
             if (p === 'playing' || p === 'countIn') return 'Pause';
             if (p === 'paused') return 'Resume';
-            if (p === 'preview') return 'Stop preview';
+            if (p === 'preview') return 'Pause';
+            if (p === 'previewPaused') return 'Resume';
             return 'Start';
         }, [trainer.phase]);
 
         const startAction = useMemo(() => {
-            if (trainer.phase === 'preview') return trainer.previewToggle;
+            if (trainer.phase === 'preview' || trainer.phase === 'previewPaused') return trainer.previewToggle;
             return trainer.pauseToggle;
         }, [trainer]);
 
@@ -714,7 +725,7 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                     {scoreOk ? (
                         <PhraseSheetMusic
                             score={trainer.activeScore}
-                            currentIdx={trainer.currentIdx}
+                            currentIdx={trainer.phase === 'preview' || trainer.phase === 'previewPaused' ? trainer.previewIdx : trainer.currentIdx}
                             statuses={trainer.statuses}
                             clef={activeClef}
                             transpose={activeTranspose}
@@ -758,13 +769,36 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                     </button>
                     {!settings.zenMode && (
                         <>
+                            {trainer.phase === 'previewPaused' && (
+                                <div className="transport-step-group" role="group" aria-label="Preview stepping">
+                                    <button
+                                        className="hint-button step-button"
+                                        onClick={() => trainer.previewStep(-1)}
+                                        title="One event back (while previewing)"
+                                        aria-label="Step back"
+                                    >
+                                        <SkipBack size={16} />
+                                    </button>
+                                    <button
+                                        className="hint-button step-button"
+                                        onClick={() => trainer.previewStep(1)}
+                                        title="One event forward (while previewing)"
+                                        aria-label="Step forward"
+                                    >
+                                        <SkipForward size={16} />
+                                    </button>
+                                </div>
+                            )}
                             <button
-                                className="hint-button"
+                                className={`hint-button ${trainer.phase === 'preview' || trainer.phase === 'previewPaused' ? 'active' : ''}`}
                                 onClick={trainer.previewToggle}
-                                title="Preview the phrase (P)"
+                                title="Preview: play / pause / resume (P)"
                             >
-                                {trainer.phase === 'preview' ? <Square size={18} /> : <Volume2 size={18} />}
+                                {trainer.phase === 'preview'
-                                {trainer.phase === 'preview' ? 'Stop' : 'Preview'}
+                                    ? <><Pause size={18} /> Pause</>
+                                    : trainer.phase === 'previewPaused'
+                                        ? <><Play size={18} /> Resume</>
+                                        : <><Volume2 size={18} /> Preview</>}
                             </button>
                             <button className="hint-button" onClick={trainer.retry} title="Retry from the start (R)">
                                 <RotateCcw size={18} />
@@ -799,28 +833,45 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
                             )}
                         </>
                     )}
-                    {!settings.zenMode && currentInstrumentDef.showTuning && (
-                        <button
-                            className={`hint-button ${settings.showFretboard ? 'active' : ''}`}
-                            onClick={() => setSettings(s => ({ ...s, showFretboard: !s.showFretboard }))}
-                            title={`Toggle Virtual ${currentInstrumentDef.displayName} (Keyboard Shortcut: V)`}
-                        >
-                            <Guitar size={18} />
-                            {currentInstrumentDef.id === 'piano' ? 'Piano' : 'Guitar'}
-                        </button>
-                    )}
-                    {!settings.zenMode && (
-                        <button
-                            className={`hint-button ${settings.showHint ? 'active' : ''}`}
-                            onClick={() => setSettings(s => ({ ...s, showHint: !s.showHint }))}
-                            title="Keyboard Shortcut: H"
-                        >
-                            <HelpCircle size={18} />
-                            {settings.showHint ? "Hide Hint" : "Show Hint"}
-                        </button>
-                    )}
                 </div>
 
+                {/* Display toggles — separate row, switch style (like the
+                    tuner/metronome switches): pure show/hide, no run state. */}
+                {!settings.zenMode && (
+                    <div className="display-toggles">
+                        {currentInstrumentDef.showTuning && (
+                            <div className="display-toggle">
+                                <span className="display-toggle-label">
+                                    <Guitar size={15} />
+                                    {currentInstrumentDef.id === 'piano' ? 'Piano' : 'Guitar'}
+                                </span>
+                                <button
+                                    className={`switch-button ${settings.showFretboard ? 'active' : ''}`}
+                                    onClick={() => setSettings(s => ({ ...s, showFretboard: !s.showFretboard }))}
+                                    title={`Toggle Virtual ${currentInstrumentDef.displayName} (Keyboard Shortcut: V)`}
+                                    aria-label={`Show virtual ${currentInstrumentDef.displayName}`}
+                                >
+                                    <div className="switch-thumb" />
+                                </button>
+                            </div>
+                        )}
+                        <div className="display-toggle">
+                            <span className="display-toggle-label">
+                                <HelpCircle size={15} />
+                                Hint
+                            </span>
+                            <button
+                                className={`switch-button ${settings.showHint ? 'active' : ''}`}
+                                onClick={() => setSettings(s => ({ ...s, showHint: !s.showHint }))}
+                                title="Keyboard Shortcut: H"
+                                aria-label="Show hint"
+                            >
+                                <div className="switch-thumb" />
+                            </button>
+                        </div>
+                    </div>
+                )}
+
 
                 {/* Hint instruments */}
                 {(settings.showHint || settings.showFretboard) && currentInstrumentDef.showTuning && (

src/components/SingleNoteTrainer.tsx

@@ -149,38 +149,57 @@ export const SingleNoteTrainer = forwardRef<SingleNoteHandle, SingleNoteTrainerP
                 )}
 
                 {!settings.zenMode && (
-                    <div className="action-row" style={{ marginTop: '24px', display: 'flex', justifyContent: 'center', gap: '16px' }}>
+                    <>
-                        {currentInstrumentDef.showTuning && (
+                        {/* Display toggles — switch style (like phrase mode):
+                            pure show/hide, no trainer actions. */}
+                        <div className="display-toggles" style={{ marginTop: '24px' }}>
+                            {currentInstrumentDef.showTuning && (
+                                <div className="display-toggle">
+                                    <span className="display-toggle-label">
+                                        <Guitar size={15} />
+                                        {currentInstrumentDef.id === 'piano' ? 'Piano' : 'Guitar'}
+                                    </span>
+                                    <button
+                                        className={`switch-button ${settings.showFretboard ? 'active' : ''}`}
+                                        onClick={() => setSettings(s => ({ ...s, showFretboard: !s.showFretboard }))}
+                                        title={`Toggle Virtual ${currentInstrumentDef.displayName} (Keyboard Shortcut: V)`}
+                                        aria-label={`Show virtual ${currentInstrumentDef.displayName}`}
+                                    >
+                                        <div className="switch-thumb" />
+                                    </button>
+                                </div>
+                            )}
+                            <div className="display-toggle">
+                                <span className="display-toggle-label">
+                                    <HelpCircle size={15} />
+                                    Hint
+                                </span>
+                                <button
+                                    className={`switch-button ${settings.showHint ? 'active' : ''}`}
+                                    onClick={() => setSettings(s => ({ ...s, showHint: !s.showHint }))}
+                                    title="Keyboard Shortcut: H"
+                                    aria-label="Show hint"
+                                >
+                                    <div className="switch-thumb" />
+                                </button>
+                            </div>
+                        </div>
+
+                        <div className="action-row" style={{ marginTop: '16px', display: 'flex', justifyContent: 'center', gap: '16px' }}>
                             <button
-                                className={`hint-button ${settings.showFretboard ? 'active' : ''}`}
+                                className="hint-button"
-                                onClick={() => setSettings(s => ({ ...s, showFretboard: !s.showFretboard }))}
+                                onClick={() => playNote(targetMidi, settings.referenceNoteDuration ?? 1.5, settings.autoPlayVolume ?? 0.5)}
-                                title={`Toggle Virtual ${currentInstrumentDef.displayName} (Keyboard Shortcut: V)`}
+                                title="Keyboard Shortcut: P or R"
                             >
-                                <Guitar size={18} />
+                                <Volume2 size={18} />
-                                {currentInstrumentDef.id === 'piano' ? 'Piano' : 'Guitar'}
+                                Play Note
                             </button>
-                        )}
+                            <button className="skip-button" onClick={() => generateNewNote()} title="Keyboard Shortcut: Space">
-                        <button
+                                <SkipForward size={18} />
-                            className={`hint-button ${settings.showHint ? 'active' : ''}`}
+                                Skip Note
-                            onClick={() => setSettings(s => ({ ...s, showHint: !s.showHint }))}
+                            </button>
-                            title="Keyboard Shortcut: H"
+                        </div>
-                        >
+                    </>
-                            <HelpCircle size={18} />
-                            {settings.showHint ? "Hide Hint" : "Show Hint"}
-                        </button>
-                        <button
-                            className="hint-button"
-                            onClick={() => playNote(targetMidi, settings.referenceNoteDuration ?? 1.5, settings.autoPlayVolume ?? 0.5)}
-                            title="Keyboard Shortcut: P or R"
-                        >
-                            <Volume2 size={18} />
-                            Play Note
-                        </button>
-                        <button className="skip-button" onClick={() => generateNewNote()} title="Keyboard Shortcut: Space">
-                            <SkipForward size={18} />
-                            Skip Note
-                        </button>
-                    </div>
                 )}
             </div>
         );

src/hooks/useGameLogic.ts

@@ -85,7 +85,11 @@ export const useGameLogic = (
 
     const { restart: restartMetronome } = useMetronome({
         bpm: effectiveBpm,
-        volume: settings.rhythm.sound ? settings.rhythm.volume : 0,
+        // Audible clicks come from the shared footer widget (Controls) in
+        // non-zen single-note modes — this scheduler is only the tick source
+        // for auto-advance. Sounding it here too doubles every beat. In zen
+        // mode the widget isn't rendered, so this scheduler IS the click.
+        volume: settings.zenMode && settings.rhythm.sound ? settings.rhythm.volume : 0,
         playing: settings.rhythm.active,
         onTick: handleTick
     });

src/hooks/useMetronome.ts

@@ -34,6 +34,8 @@ export function useMetronome({ bpm, volume, playing, onTick }: MetronomeOptions)
 
     const playClick = useCallback((time: number) => {
         if (!audioContext.current) return;
+        onTickRef.current(currentBeat.current);
+        if (volume <= 0) return; // silent tick source — no audio nodes needed
 
         const osc = audioContext.current.createOscillator();
         const gainNode = audioContext.current.createGain();

src/hooks/usePhraseTrainer.ts

@@ -21,7 +21,7 @@ import { subscribeRawFrames } from './rawFrameBus';
 import { phraseRunBus } from './phraseRunBus';
 import { phraseBeatBus } from './phraseBeatBus';
 
-export type PhrasePhase = 'ready' | 'countIn' | 'playing' | 'paused' | 'preview' | 'done';
+export type PhrasePhase = 'ready' | 'countIn' | 'playing' | 'paused' | 'preview' | 'previewPaused' | 'done';
 
 export interface PhraseSelection {
     readonly startBar: number;
@@ -56,6 +56,8 @@ const REARM_AFTER_SUSTAINED_MS = 2500;
 
 export interface PhraseTrainerApi {
     readonly phase: PhrasePhase;
+    /** Event index the preview cursor points at (-1 when not previewing). */
+    readonly previewIdx: number;
     /** Active slice the user is currently working through (may be a resume tail). */
     readonly activeScore: Score;
     readonly statuses: NoteStatus[];
@@ -76,6 +78,9 @@ export interface PhraseTrainerApi {
     retry: () => void;
     skip: () => void;
     previewToggle: () => void;
+    /** While previewing: step one event forward/backward (player-style).
+      * Plays the note at the new position and moves the preview indicator. */
+    previewStep: (dir: 1 | -1) => void;
     virtualTap: (midi: number) => void;
     /** External pause (settings dialog, visibility change handled internally). */
     pause: () => void;
@@ -95,6 +100,7 @@ export function usePhraseTrainer(
     const [countInLeft, setCountInLeft] = useState(0);
     const [error, setError] = useState<string | null>(null);
     const [repeatedNoteBlocked, setRepeatedNoteBlocked] = useState(false);
+    const [previewIdx, setPreviewIdx] = useState(-1);
     const [accumulated, setAccumulated] = useState<PhraseSummary>({ total: 0, matched: 0, missed: 0, skipped: 0 });
 
     // ---- Active slice (resume tails replace it) ---------------------------
@@ -102,6 +108,8 @@ export function usePhraseTrainer(
 
     const matcherRef = useRef<PhraseMatcher | null>(null);
     const repeatBlockedRef = useRef(false);
+    const previewIdxRef = useRef(-1);
+    const previewToggleRef = useRef<(() => void) | null>(null);
     const phaseRef = useRef<PhrasePhase>('ready');
     const paceRef = useRef(config.pace);
     const configRef = useRef(config);
@@ -117,6 +125,10 @@ export function usePhraseTrainer(
     const runTokenRef = useRef(0);
     const repeatTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
     const previewTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+    /** Audio time the preview cursor is scheduled to reach (for pause). */
+    const previewEndAtRef = useRef(0);
+    /** Audio-time interval that advances the preview cursor. */
+    const previewTickRef = useRef<ReturnType<typeof setInterval> | null>(null);
 
     const events = useMemo(() => scoreEvents(activeScore), [activeScore]);
 
@@ -157,6 +169,9 @@ export function usePhraseTrainer(
         setAccumulated({ total: 0, matched: 0, missed: 0, skipped: 0 });
         audioEngine.cancelGroup(PREVIEW_GROUP);
         audioEngine.cancelGroup(CLICK_GROUP);
+        if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
+        previewIdxRef.current = -1;
+        setPreviewIdx(-1);
         setPhaseBoth('ready');
         setCurrentIdx(-1);
         setCountInLeft(0);
@@ -388,6 +403,15 @@ export function usePhraseTrainer(
     const pauseInternalRef = useRef<(() => void) | null>(null);
 
     const pause = useCallback(() => {
+        if (phaseRef.current === 'preview') {
+            // External pause during preview behaves like preview pause
+            // (cursor kept, stepping enabled) but without phase recursion.
+            audioEngine.cancelGroup(PREVIEW_GROUP);
+            if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
+            if (previewTimerRef.current) { clearTimeout(previewTimerRef.current); previewTimerRef.current = null; }
+            setPhaseBoth('previewPaused');
+            return;
+        }
         if (phaseRef.current !== 'playing' && phaseRef.current !== 'countIn') return;
         if (repeatTimerRef.current) { clearTimeout(repeatTimerRef.current); repeatTimerRef.current = null; }
         audioEngine.cancelGroup(CLICK_GROUP);
@@ -462,7 +486,7 @@ export function usePhraseTrainer(
             if (paceRef.current === 'tempo') resumeTempo();
             else setPhaseBoth('playing');
         } else if (p === 'ready' || p === 'done') start();
-        // preview: handled by previewToggle
+        else if (p === 'preview' || p === 'previewPaused') previewToggleRef.current?.();
     }, [pause, resumeTempo, setPhaseBoth, start]);
 
     const retry = useCallback(() => {
@@ -485,46 +509,115 @@ export function usePhraseTrainer(
         advanceStep(m);
     }, [advanceStep]);
 
-    const previewToggle = useCallback(() => {
+    /** Preview from event `fromIdx` to the end. A cursor interval mirrors
-        if (phaseRef.current === 'preview') {
+      * playback time so the notation indicator follows the sounding note. */
-            audioEngine.cancelGroup(PREVIEW_GROUP);
+    const playPreviewFrom = useCallback((fromIdx: number, token: number) => {
-            if (previewTimerRef.current) { clearTimeout(previewTimerRef.current); previewTimerRef.current = null; }
-            setPhaseBoth('ready');
-            return;
-        }
-        pause();
-        runTokenRef.current++;
-        const token = runTokenRef.current;
         void audioEngine.ensureRunning().then(() => {
             if (runTokenRef.current !== token) return;
             const bpm = sanitizeBpm(configRef.current.bpm);
             const spb = 60 / bpm;
             const t0 = audioEngine.now() + 0.15;
             const vol = configRef.current.previewVolume ?? 0.4;
+            const startTick = fromIdx > 0 ? events[fromIdx].startTick : 0;
+            const totalTicks = events.reduce((a, e) => Math.max(a, e.startTick + e.durationTicks), 0);
+            const secPerTick = spb / PPQ;
             for (const e of events) {
                 if (!e.pitch) continue;
-                audioEngine.scheduleNote(e.pitch.midi, t0 + (e.startTick / PPQ) * spb, (e.durationTicks / PPQ) * spb, vol, PREVIEW_GROUP);
+                if (e.startTick < startTick) continue;
+                audioEngine.scheduleNote(e.pitch.midi, t0 + ((e.startTick - startTick) / PPQ) * spb, (e.durationTicks / PPQ) * spb, vol, PREVIEW_GROUP);
             }
             // 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 - startTick) / PPQ);
-                const beats = Math.floor(totalTicks / PPQ);
                 for (let i = 0; i < beats; i++) {
-                    audioEngine.playClickAt(t0 + i * spb, CLICK_VOLUME, i % 4 === 0, PREVIEW_GROUP);
+                    audioEngine.playClickAt(t0 + i * spb, CLICK_VOLUME, (fromIdx + i) % 4 === 0, PREVIEW_GROUP);
                 }
             }
             setPhaseBoth('preview');
-            const totalSec = (events.reduce((a, e) => Math.max(a, e.startTick + e.durationTicks), 0) / PPQ) * spb;
+
-            previewTimerRef.current = setTimeout(() => {
+            // Cursor: advance previewIdx by audio time (event start ticks).
-                if (runTokenRef.current === token) {
+            previewEndAtRef.current = t0 + (totalTicks - startTick) * secPerTick;
+            if (previewTickRef.current) clearInterval(previewTickRef.current);
+            previewTickRef.current = setInterval(() => {
+                if (phaseRef.current !== 'preview' || runTokenRef.current !== token) {
+                    if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
+                    return;
+                }
+                const elapsedTicks = Math.max(0, (audioEngine.now() - t0) / secPerTick) + startTick;
+                let idx = previewIdxRef.current;
+                let advanced = false;
+                while (idx + 1 < events.length && events[idx + 1].startTick <= elapsedTicks) { idx++; advanced = true; }
+                if (advanced) { previewIdxRef.current = idx; setPreviewIdx(idx); }
+                if (audioEngine.now() >= previewEndAtRef.current + 0.2) {
+                    if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
+                    previewIdxRef.current = -1;
+                    setPreviewIdx(-1);
                     setPhaseBoth('ready');
                 }
-            }, 150 + totalSec * 1000 + 200);
+            }, 60);
         });
-    }, [events, pause, setPhaseBoth]);
+    }, [events, setPhaseBoth]);
+
+    const stopPreview = useCallback(() => {
+        audioEngine.cancelGroup(PREVIEW_GROUP);
+        if (previewTimerRef.current) { clearTimeout(previewTimerRef.current); previewTimerRef.current = null; }
+        if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
+        previewIdxRef.current = -1;
+        setPreviewIdx(-1);
+        setPhaseBoth('ready');
+    }, [setPhaseBoth]);
+
+    /** Pause preview: stop scheduled audio, keep the cursor position. */
+    const previewPause = useCallback(() => {
+        if (phaseRef.current !== 'preview') return;
+        audioEngine.cancelGroup(PREVIEW_GROUP);
+        if (previewTimerRef.current) { clearTimeout(previewTimerRef.current); previewTimerRef.current = null; }
+        if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
+        setPhaseBoth('previewPaused');
+    }, [setPhaseBoth]);
+
+    const previewToggle = useCallback(() => {
+        const p = phaseRef.current;
+        if (p === 'preview') {
+            previewPause();
+            return;
+        }
+        if (p === 'previewPaused') {
+            // Resume from the paused cursor position.
+            runTokenRef.current++;
+            const token = runTokenRef.current;
+            playPreviewFrom(previewIdxRef.current, token);
+            return;
+        }
+        pause();
+        runTokenRef.current++;
+        const token = runTokenRef.current;
+        previewIdxRef.current = 0;
+        setPreviewIdx(0);
+        playPreviewFrom(0, token);
+    }, [pause, playPreviewFrom, previewPause, stopPreview]);
+    previewToggleRef.current = previewToggle;
+
+    /** Player-style stepping — only while the preview is PAUSED: move the
+      * cursor one event and play that single note (find-it-on-the-neck). */
+    const previewStep = useCallback((dir: 1 | -1) => {
+        if (phaseRef.current !== 'previewPaused') return;
+        const nextIdx = Math.max(0, Math.min(events.length - 1, previewIdxRef.current + dir));
+        if (nextIdx === previewIdxRef.current) return;
+        previewIdxRef.current = nextIdx;
+        setPreviewIdx(nextIdx);
+        // Play just this one event as an audible cue.
+        runTokenRef.current++;
+        const token = runTokenRef.current;
+        const e = events[nextIdx];
+        void audioEngine.ensureRunning().then(() => {
+            if (runTokenRef.current !== token || !e.pitch) return;
+            audioEngine.scheduleNote(e.pitch.midi, audioEngine.now() + 0.05, (e.durationTicks / PPQ) * (60 / sanitizeBpm(configRef.current.bpm)), configRef.current.previewVolume ?? 0.4, PREVIEW_GROUP);
+        });
+    }, [events, setPhaseBoth]);
 
     const virtualTap = useCallback((midi: number) => {
         const p = phaseRef.current;
@@ -548,6 +641,7 @@ export function usePhraseTrainer(
     const stop = useCallback(() => {
         if (repeatTimerRef.current) { clearTimeout(repeatTimerRef.current); repeatTimerRef.current = null; }
         if (previewTimerRef.current) { clearTimeout(previewTimerRef.current); previewTimerRef.current = null; }
+        if (previewTickRef.current) { clearInterval(previewTickRef.current); previewTickRef.current = null; }
         audioEngine.cancelGroup(PREVIEW_GROUP);
         audioEngine.cancelGroup(CLICK_GROUP);
         runTokenRef.current++;
@@ -576,6 +670,7 @@ export function usePhraseTrainer(
         // Unmount: cancel all scheduled audio and timers.
         if (repeatTimerRef.current) clearTimeout(repeatTimerRef.current);
         if (previewTimerRef.current) clearTimeout(previewTimerRef.current);
+        if (previewTickRef.current) clearInterval(previewTickRef.current);
         audioEngine.cancelGroup(PREVIEW_GROUP);
         audioEngine.cancelGroup(CLICK_GROUP);
     }, []);
@@ -602,6 +697,7 @@ export function usePhraseTrainer(
         statuses,
         currentIdx,
         countInLeft,
+        previewIdx,
         scoreStart: scoreStartRef.current,
         spb: spbRef.current,
         error,
@@ -611,6 +707,7 @@ export function usePhraseTrainer(
         retry,
         skip,
         previewToggle,
+        previewStep,
         virtualTap,
         pause,
         stop,

src/types/SettingsTypes.ts

@@ -134,6 +134,11 @@ export interface AppSettings {
     instrument: string;
     rhythm: RhythmSettings;
     zenMode: boolean;
+    /**
+     * TODO: Rename 'sight_reading' to 'learn_notes' internally (UI label is
+     * already "Learn Notes"). Deferred because the value is persisted in
+     * localStorage — needs a settings migration for existing users.
+     */
     gameMode: 'sight_reading' | 'ear_training' | 'phrase' | 'assist';
     customMinFret?: number;
     customMaxFret?: number;