T5: unified MIDI routing - thay native preview bang UnifiedMidiRouter + TrackInstrument (per-track FluidSynth channel); keybed/click/draw/hardware MIDI note qua router, fallback SonicSF; _panicMidi stop moi voice; bo _nativeSfPreviews/playNativeSfNote/stopNativeSfNote/stopAllNativeSfNotes/_sfWasmFallbackNote

app/static/js/app.jsx

@@ -200,101 +200,86 @@ const isVstTrackEngine = (se) => !!se && String(se.type || '').indexOf('vst') !=
 // Track dùng VSTi + Carla local → route Carla (native GUI, realtime).
 const shouldRouteCarla = () => false; // live playback 100% client (SF2 autosampled WASM) — không route Carla
 
-// ── Native soundfont preview (standalone) ─────────────────────────────────
-// Render 1 note bằng backend native FluidSynth (pyfluidsynth) → play WAV.
-// Mỗi key (thường = track.id) một Audio element — note mới stop note cũ;
-// token chống stale (response cũ không đè response mới).
-const _nativeSfPreviews = {};
-// WASM fallback: backend pyfluidsynth render HONG tren ban standalone
-// (thieu libfluidsynth DLL) -> /soundfont-render 501 -> apiRequest throw ->
-// native path cam lang. Fallback choi note TRUC TIEP qua SonicSF (Web Audio
-// + libfluidsynth WASM da bundle) - am ra _gainNode -> masterBus.input.
-// window.__nativeSfOk: undefined (chua biet) | true (native OK) | false (dung WASM).
-const _sfWasmFallbackNote = (track, pitch, velocity, durationMs, startTime, key, token) => {
+// ── Unified MIDI routing (preview mọi nguồn) ───────────────────────────────
+// Mọi note preview (keybed, piano roll, draw, hardware MIDI, click) đi qua
+// UnifiedMidiRouter + TrackInstrument (FluidSynth channel per-track). Router
+// chống re-trigger (note-on trùng key chỉ tăng count), panicAllNotesOff dừng
+// mọi voice khi stop. Fallback SonicSF trực tiếp nếu router chưa sẵn sàng.
+let _midiRouter = null;
+let _midiFilePreviewAudio = null;
+const _getMidiRouter = () => {
   try {
-    const eng = track && track.synth_engine;
-    const sfId = (eng && eng.soundfont_id) || (track && track.instrumentId && String(track.instrumentId).startsWith('sf_') ? track.instrumentId : null);
-    if (!sfId) return;
-    const bank = (eng && eng.soundfont_bank) || 0;
-    const program = (eng && eng.soundfont_program) || (track && track.instrumentProgram !== undefined ? track.instrumentProgram : 0);
-    const k = key || (track ? track.id : 'global');
-    if (_nativeSfPreviews[k] && token != null && _nativeSfPreviews[k].token > token) return; // stale (claim-then-compare: chi bo neu co note MOI HON)
-    const S = window.SonicSF;
-    if (!S) return;
-    const ch = (track && track.midiChannel != null) ? track.midiChannel : 0;
-    const durMs = Math.max(200, durationMs || 500);
-    const ctx = getAudioContext();
-    const delaySec = startTime ? Math.max(0, (startTime - ctx.currentTime)) : 0;
-    _nativeSfPreviews[k] = { wasm: { ch: ch, pitch: pitch }, token: token };
-    const fire = function () {
-      Promise.resolve(S.selectInstrument(ch, bank, program, sfId)).then(function () {
-        S.playNote(pitch, velocity != null ? velocity : 0.8, durMs, undefined, eng ? undefined : program, null, ch, eng || undefined);
-      }).catch(function () {
-        try { S.playNote(pitch, velocity != null ? velocity : 0.8, durMs, undefined, eng ? undefined : program, null, ch, eng || undefined); } catch (e2) {}
-      });
-    };
-    if (delaySec > 0) { setTimeout(fire, delaySec * 1000); } else { fire(); }
-  } catch (e) { console.warn('[NativeSF] wasm fallback note error:', e); }
-};
-const playNativeSfNote = (track, pitch, velocity, durationMs, startTime, key) => {
-  try {
-    const eng = track && track.synth_engine;
-    const sfId = (eng && eng.soundfont_id) || (track && track.instrumentId && String(track.instrumentId).startsWith('sf_') ? track.instrumentId : null);
-    if (!sfId) return;
-    const bank = (eng && eng.soundfont_bank) || 0;
-    const program = (eng && eng.soundfont_program) || (track && track.instrumentProgram !== undefined ? track.instrumentProgram : 0);
-    const k = key || (track ? track.id : 'global');
-    const prev = _nativeSfPreviews[k];
-    const token = (prev ? prev.token : 0) + 1;
-    // Native hong da biet (501) -> di thang WASM fallback, khong goi API.
-    if (window.__nativeSfOk === false) {
-      _sfWasmFallbackNote(track, pitch, velocity, durationMs, startTime, k, token);
-      return;
+    if (!_midiRouter && window.SonicUnifiedMidiRouter && window.SonicUnifiedMidiRouter.UnifiedMidiRouter && window.TrackInstrument) {
+      _midiRouter = new window.SonicUnifiedMidiRouter.UnifiedMidiRouter();
     }
-    const durationSec = Math.max(0.2, (durationMs || 500) / 1000);
-    window.SonicAPI.soundfontRender({
-      soundfont_id: sfId,
-      bank: bank,
-      program: program,
-      bpm: 120,
-      notes: [{ pitch: pitch, start_beat: 0, duration_beats: durationSec * 2, velocity: velocity != null ? velocity : 0.8 }],
-    }).then(function (res) {
-      if (!res || !res.success || !res.url) {
-        window.__nativeSfOk = false;
-        _sfWasmFallbackNote(track, pitch, velocity, durationMs, startTime, k, token);
-        return;
-      }
-      if (_nativeSfPreviews[k] && _nativeSfPreviews[k].token > token) return; // stale (claim-then-compare: chi bo neu co note MOI HON)
-      window.__nativeSfOk = true;
-      const audio = new Audio(API_BASE_URL + res.url);
-      _nativeSfPreviews[k] = { audio: audio, token: token };
-      const ctx = getAudioContext();
-      const delay = startTime ? Math.max(0, (startTime - ctx.currentTime) * 1000) : 0;
-      setTimeout(function () {
-        if (!_nativeSfPreviews[k] || _nativeSfPreviews[k].audio !== audio) return;
-        audio.play().catch(function () {});
-        audio._sfStopTimer && clearTimeout(audio._sfStopTimer);
-        audio._sfStopTimer = setTimeout(function () { try { audio.pause(); } catch (e) {} }, durationSec * 1000 + 400);
-      }, delay);
-    }).catch(function () {
-      window.__nativeSfOk = false;
-      _sfWasmFallbackNote(track, pitch, velocity, durationMs, startTime, k, token);
-    });
-  } catch (e) { console.warn('[NativeSF] playNativeSfNote error:', e); }
+  } catch (e) { _midiRouter = null; }
+  return _midiRouter;
 };
-const stopNativeSfNote = (key) => {
+const _makeCtx = (ch, program, synthEngine, dest) => ({
+  ch: ch != null ? ch : 0,
+  program,
+  synthEngine,
+  sfId: (synthEngine && synthEngine.soundfont_id) || undefined,
+  bank: (synthEngine && synthEngine.soundfont_bank) || 0,
+  prog: (synthEngine && synthEngine.soundfont_program) || (program != null ? program : 0),
+  dest: dest || null
+});
+// Note-on qua router. Trả true nếu router xử lý, false nếu caller phải fallback
+// SonicSF trực tiếp. ctx: TrackInstrumentCtx (ch/program/synthEngine/dest).
+const _routeNoteOn = (trackId, ctx, pitch, velocity, durationMs, sourceType) => {
+  if (trackId === undefined || trackId === null || !ctx) return false;
+  const router = _getMidiRouter();
+  if (!router) return false;
   try {
-    const k = key || 'global';
-    const prev = _nativeSfPreviews[k];
-    if (!prev) return;
-    prev.token++;
-    try { if (prev.audio) { prev.audio.pause(); prev.audio.currentTime = 0; } } catch (e) {}
-    try { if (prev.wasm && window.SonicSF) window.SonicSF.stopNote(prev.wasm.ch, prev.wasm.pitch); } catch (e) {}
-  } catch (e) {}
+    const inst = new window.TrackInstrument(trackId, ctx);
+    router.registerEngine(trackId, inst);
+    router.dispatchMidiEvent({
+      trackId,
+      command: 0x90,
+      channel: ctx.ch,
+      pitch,
+      velocity: velocity != null ? velocity : 0.8,
+      durationMs,
+      source: sourceType || 'PREVIEW'
+    });
+    return true;
+  } catch (e) { console.warn('[MidiRouter] note-on error:', e); return false; }
 };
-const stopAllNativeSfNotes = () => {
-  try { Object.keys(_nativeSfPreviews).forEach(function (k) { stopNativeSfNote(k); }); } catch (e) {}
+const _routeNoteOff = (trackId, ctx, pitch, sourceType) => {
+  if (trackId === undefined || trackId === null || !ctx) return false;
+  const router = _getMidiRouter();
+  if (!router) return false;
+  try {
+    router.dispatchMidiEvent({
+      trackId,
+      command: 0x80,
+      channel: ctx.ch,
+      pitch,
+      source: sourceType || 'PREVIEW'
+    });
+    return true;
+  } catch (e) { console.warn('[MidiRouter] note-off error:', e); return false; }
 };
+// Fire-and-forget: note-on + note-off sau durationMs+60 (giữ tracker đối xứng
+// cho click/draw/playing-tick không có note-off riêng).
+const _routePreviewNote = (trackId, ctx, pitch, velocity, durationMs, sourceType) => {
+  if (!_routeNoteOn(trackId, ctx, pitch, velocity, durationMs, sourceType)) return false;
+  const dur = Math.max(50, durationMs || 500);
+  setTimeout(() => { _routeNoteOff(trackId, ctx, pitch, sourceType); }, dur + 60);
+  return true;
+};
+const _stopMidiFilePreview = () => {
+  if (_midiFilePreviewAudio) {
+    try { _midiFilePreviewAudio.pause(); _midiFilePreviewAudio.currentTime = 0; } catch (e) {}
+    _midiFilePreviewAudio = null;
+  }
+};
+const _panicMidi = () => {
+  _stopMidiFilePreview();
+  const router = _getMidiRouter();
+  if (router) { try { router.panicAllNotesOff(); } catch (e) {} }
+};
+
 
 // ── Native soundfont item render (standalone, transport) ──────────────────
 // Render TOÀN BỘ MIDI item bằng native FluidSynth → decode AudioBuffer →
@@ -8291,7 +8276,9 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
           ensureSonicInstrument(pvCtx);
           playing.forEach(n => {
             if (isStandaloneSf() && isSfTrackEngine(pvCtx.synthEngine) && !shouldRouteCarla(pvCtx.synthEngine)) {
-              playNativeSfNote(pvTrk, n.pitch, n.velocity || 0.8, 200, undefined, 'pv_' + st.trackId);
+              if (!_routePreviewNote(pvTrk && pvTrk.id, pvCtx, n.pitch, n.velocity || 0.8, 200, 'PLAYING_TICK')) {
+                window.SonicSF.playNote(n.pitch, (n.velocity || 0.8) * 127, 200, ctx.currentTime, pvCtx.program, null, pvCtx.ch, pvCtx.synthEngine);
+              }
               return;
             }
             window.SonicSF.playNote(n.pitch, (n.velocity || 0.8) * 127, 200, ctx.currentTime, pvCtx.program, null, pvCtx.ch, pvCtx.synthEngine);
@@ -8661,7 +8648,9 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         var clCtx = resolveTrackInstrumentCtx(clTrk, activeTracks);
         ensureSonicInstrument(clCtx);
         if (isStandaloneSf() && isSfTrackEngine(clCtx.synthEngine) && !shouldRouteCarla(clCtx.synthEngine)) {
-          playNativeSfNote(clTrk, notes[clickedNoteIdx].pitch, notes[clickedNoteIdx].velocity || 0.8, 300, undefined, 'pv_' + st.trackId);
+          if (!_routePreviewNote(clTrk && clTrk.id, clCtx, notes[clickedNoteIdx].pitch, notes[clickedNoteIdx].velocity || 0.8, 300, 'CLICK')) {
+            window.SonicSF.playNote(notes[clickedNoteIdx].pitch, 100, 300, ctx.currentTime, clCtx.program, null, clCtx.ch, clCtx.synthEngine);
+          }
         } else {
           window.SonicSF.playNote(notes[clickedNoteIdx].pitch, 100, 300, ctx.currentTime, clCtx.program, null, clCtx.ch, clCtx.synthEngine);
         }
@@ -8921,11 +8910,17 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         previewNodesRef.current = null;
       }
       var dwTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
+      var dwCtx = resolveTrackInstrumentCtx(dwTrk, activeTracks);
       var dwCh = dwTrk ? assignTrackMidiChannel(dwTrk, activeTracks) : 0;
       var dwPitch = snapToScaleRef.current ? snapPitchToScale(pitch, selectedScaleRef.current) : pitch;
       var dwDurMs = Math.max(100, Math.round(initialDur * (60 / bpm) * 1000));
       if (isStandaloneSf() && isSfTrackEngine(dwTrk && dwTrk.synth_engine) && !shouldRouteCarla(dwTrk && dwTrk.synth_engine)) {
-        playNativeSfNote(dwTrk, dwPitch, brushVelocityRef.current || 0.8, dwDurMs, undefined, 'pvdraw_' + st.trackId);
+        if (!_routePreviewNote(dwTrk && dwTrk.id, dwCtx, dwPitch, brushVelocityRef.current || 0.8, dwDurMs, 'DRAW')) {
+          if (window.SonicSF && window.SonicSF.playNote) {
+            const ctx = getAudioContext();
+            window.SonicSF.playNote(dwPitch, Math.round(brushVelocityRef.current * 127), dwDurMs, ctx.currentTime, dwTrk ? dwTrk.instrumentProgram : undefined, null, dwCh, dwTrk ? dwTrk.synth_engine : undefined);
+          }
+        }
       } else if (window.SonicSF && window.SonicSF.playNote) {
         const ctx = getAudioContext();
         // playNote (FluidSynth — nhạc cụ THẬT của track). _playNoteFallback chỉ
@@ -9026,7 +9021,14 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         var pvTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
         var pvCtxInst = resolveTrackInstrumentCtx(pvTrk, activeTracks);
         if (isStandaloneSf() && isSfTrackEngine(pvCtxInst.synthEngine) && !shouldRouteCarla(pvCtxInst.synthEngine)) {
-          playNativeSfNote(pvTrk, p, brushVelocityRef.current || 0.8, durMs, undefined, 'pvdraw_' + st.trackId);
+          if (!_routePreviewNote(pvTrk && pvTrk.id, pvCtxInst, p, brushVelocityRef.current || 0.8, durMs, 'DRAW')) {
+            if (window.SonicSF && window.SonicSF.playNote) {
+              var pvCtx = getAudioContext();
+              var pvVel = Math.round(brushVelocityRef.current * 127);
+              window.SonicSF.playNote(p, pvVel, durMs, pvCtx.currentTime, pvCtxInst.program, null, pvCtxInst.ch, pvCtxInst.synthEngine);
+              previewPitchRef.current = p;
+            }
+          }
         } else if (window.SonicSF && window.SonicSF.playNote) {
           var pvCtx = getAudioContext();
           var pvVel = Math.round(brushVelocityRef.current * 127);
@@ -9420,9 +9422,10 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
               }
               const kbNative = isStandaloneSf() && isSfTrackEngine(kbCtx.synthEngine) && !shouldRouteCarla(kbCtx.synthEngine);
               if (kbNative) {
-                playNativeSfNote(kbTrk, pitch, 100 / 127, 5000, undefined, 'kb_' + st.trackId + '_' + pitch);
+                if (!_routeNoteOn(kbTrk && kbTrk.id, kbCtx, pitch, 100 / 127, 5000, 'KEYBED')) {
+                  window.SonicSF.playNote(pitch, 100, 5000, undefined, kbCtx.program, null, kbCtx.ch, kbCtx.synthEngine);
                 }
-              if (window.SonicSF && !kbNative) {
+              } else if (window.SonicSF) {
                 // ⚠️ FIX: giữ note theo thời gian bấm phím — durationMs lớn (5s)
                 // chỉ là auto-off phòng hờ; mouseup/mouseleave gọi stopNote dừng
                 // NGAY (trước đây 500ms → note tự tắt giữa chừng khi giữ phím).
@@ -9445,9 +9448,10 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
                   window.triggerMidiVuActivity((st.parent_tab_id && st.parent_tab_id.startsWith('session_') ? '_sess_' : '') + st.trackId, 100);
                 }
                 if (isStandaloneSf() && isSfTrackEngine(kbCtx.synthEngine) && !shouldRouteCarla(kbCtx.synthEngine)) {
-                  playNativeSfNote(kbTrk, pitch, 100 / 127, 5000, undefined, 'kb_' + st.trackId + '_' + pitch);
+                  if (!_routeNoteOn(kbTrk && kbTrk.id, kbCtx, pitch, 100 / 127, 5000, 'KEYBED')) {
+                    window.SonicSF.playNote(pitch, 100, 5000, undefined, kbCtx.program, null, kbCtx.ch, kbCtx.synthEngine);
                   }
-                if (window.SonicSF && !(isStandaloneSf() && isSfTrackEngine(kbCtx.synthEngine) && !shouldRouteCarla(kbCtx.synthEngine))) {
+                } else if (window.SonicSF) {
                   // giữ note khi kéo qua phím (mouse enter) — dừng bằng mouseup/leave
                   window.SonicSF.playNote(pitch, 100, 5000, undefined, kbCtx.program, null, kbCtx.ch, kbCtx.synthEngine);
                 }
@@ -9463,7 +9467,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
             keybedMouseDownRef.current = false;
             // Dừng note khi thả phím — tránh kẹt âm (loop liên tục) với soundfont
             try {
-              if (isStandaloneSf()) stopNativeSfNote('kb_' + st.trackId + '_' + pitch);
+              if (isStandaloneSf()) _routeNoteOff(kbTrk && kbTrk.id, kbCtx, pitch, 'KEYBED');
               if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(kbCtx.ch, pitch);
             } catch (e) {}
             if (window.__carlaKeybedTimer) { clearTimeout(window.__carlaKeybedTimer); window.__carlaKeybedTimer = null; }
@@ -9473,7 +9477,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
             if (!keybedMouseDownRef.current) return;
             // Kéo chuột ra khỏi phím → dừng note của phím đó
             try {
-              if (isStandaloneSf()) stopNativeSfNote('kb_' + st.trackId + '_' + pitch);
+              if (isStandaloneSf()) _routeNoteOff(kbTrk && kbTrk.id, kbCtx, pitch, 'KEYBED');
               if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(kbCtx.ch, pitch);
             } catch (e) {}
             if (window.SonicCarlaMidi) { try { window.SonicCarlaMidi.noteOff(kbCtx.ch, pitch); } catch (e) {} }
@@ -14167,7 +14171,7 @@ const MediaExplorerPanel = ({ height, clipboardRef, active }) => {
       selectTokenRef.current++;
       const token = selectTokenRef.current;
       try { if (window.SonicSF && typeof window.SonicSF.stopAll === 'function') window.SonicSF.stopAll(); } catch (e) {}
-      stopAllNativeSfNotes();
+      _panicMidi();
       playMidiPreview(cur, token);
     }
   };
@@ -14264,7 +14268,8 @@ const MediaExplorerPanel = ({ height, clipboardRef, active }) => {
             if (selectTokenRef.current !== (token || selectTokenRef.current)) return;
             const audio = new Audio(API_BASE_URL + res.url);
             audio.loop = !!isLoopingRef.current;
-            _nativeSfPreviews['midifile'] = { audio: audio, token: selectTokenRef.current };
+            if (_midiFilePreviewAudio) { try { _midiFilePreviewAudio.pause(); } catch (e) {} }
+            _midiFilePreviewAudio = audio;
             audio.play().catch(function () {});
           });
         }
@@ -14328,7 +14333,7 @@ const MediaExplorerPanel = ({ height, clipboardRef, active }) => {
     if (rafRef.current) cancelAnimationFrame(rafRef.current);
     rafRef.current = null;
     if (loopTimerRef.current) { clearInterval(loopTimerRef.current); loopTimerRef.current = null; }
-    stopNativeSfNote('midifile');
+    _stopMidiFilePreview();
     if (window.SonicSF && typeof window.SonicSF.stopAll === 'function') {
       try { window.SonicSF.stopAll(); } catch (e) {}
     }
@@ -14643,7 +14648,7 @@ const MediaExplorerPanel = ({ height, clipboardRef, active }) => {
       selectTokenRef.current++;
       const token = selectTokenRef.current;
       try { if (window.SonicSF && typeof window.SonicSF.stopAll === 'function') window.SonicSF.stopAll(); } catch (e) {}
-      stopAllNativeSfNotes();
+      _panicMidi();
       playMidiPreview(cur, token);
     }
   };
@@ -14814,7 +14819,7 @@ const MediaExplorerPanel = ({ height, clipboardRef, active }) => {
           selectTokenRef.current++;
           const token = selectTokenRef.current;
           try { if (window.SonicSF && typeof window.SonicSF.stopAll === 'function') window.SonicSF.stopAll(); } catch (e) {}
-          stopAllNativeSfNotes();
+          _panicMidi();
           playMidiPreview(cur, token);
         }
       }
@@ -15472,7 +15477,7 @@ const App = () => {
       if (_wasVst && !_nowVst && window.SonicCarlaMidi && window.SonicCarlaMidi.stopBridge) {
         window.SonicCarlaMidi.stopBridge();
         try { if (window.SonicSF && window.SonicSF.stopAll) window.SonicSF.stopAll(); } catch (e) {}
-        stopAllNativeSfNotes();
+        _panicMidi();
         console.log('[Instrument] Carla bridge unloaded — track', trackId, 'switched from VSTi to non-VST');
       }
     } catch (e) { console.warn('[Instrument] carla-stop on instrument switch error:', e); }
@@ -15742,7 +15747,9 @@ const App = () => {
                             heldMidiNotesRef.current[as.trackId] = (heldMidiNotesRef.current[as.trackId] || 0) + 1;
                           } catch (err) { }
                           if (isStandaloneSf() && isSfTrackEngine(asSe) && !shouldRouteCarla(asSe)) {
-                            playNativeSfNote(asTrk, pitch, scaledVel / 127, 60000, undefined, 'midi_' + as.trackId + '_' + pitch);
+                            if (!_routeNoteOn(asTrk && asTrk.id, _makeCtx(asCh, asProg, asSe, null), pitch, scaledVel / 127, 60000, 'HARDWARE_KEYBOARD')) {
+                              window.SonicSF.playNote(pitch, scaledVel, 60000, undefined, asProg, null, asCh, asSe);
+                            }
                           } else {
                             window.SonicSF.playNote(pitch, scaledVel, 60000, undefined, asProg, null, asCh, asSe);
                           }
@@ -15767,7 +15774,9 @@ const App = () => {
                           heldMidiNotesRef.current[at.id] = (heldMidiNotesRef.current[at.id] || 0) + 1;
                         } catch (err) { }
                         if (isStandaloneSf() && isSfTrackEngine(atSe) && !shouldRouteCarla(atSe)) {
-                          playNativeSfNote(at, pitch, scaledVel / 127, 60000, undefined, 'midi_' + at.id + '_' + pitch);
+                          if (!_routeNoteOn(at && at.id, _makeCtx(atCh, atProg, atSe, atDest), pitch, scaledVel / 127, 60000, 'HARDWARE_KEYBOARD')) {
+                            window.SonicSF.playNote(pitch, scaledVel, 60000, undefined, atProg, atDest, atCh, atSe);
+                          }
                         } else {
                           window.SonicSF.playNote(pitch, scaledVel, 60000, undefined, atProg, atDest, atCh, atSe);
                         }
@@ -15799,7 +15808,7 @@ const App = () => {
                      // channel and kill its sound.
                      if (!st.synth_engine && st.midiChannel === undefined) return;
                      var stCh = assignTrackMidiChannel(st, stopTracks);
-                     if (isStandaloneSf()) stopNativeSfNote('midi_' + st.id + '_' + pitch);
+                     if (isStandaloneSf()) _routeNoteOff(st.id, { ch: stCh }, pitch, 'HARDWARE_KEYBOARD');
                      window.SonicSF.stopNote(stCh, pitch);
                      // MIDI Keyboard → Carla bridge: note-off khi thả phím — tránh
                      // kẹt âm VSTi (giống keybed ảo).
@@ -21681,7 +21690,9 @@ const App = () => {
     var prevCh = track ? assignTrackMidiChannel(track, activeTracks) : 0;
     const routeCarla = shouldRouteCarla(track && track.synth_engine);
     if (isStandaloneSf() && !routeCarla && isSfTrackEngine(track && track.synth_engine)) {
-      playNativeSfNote(track, pitch, velocity, durationMs, null, track ? track.id : 'global');
+      if (!_routePreviewNote(track && track.id, resolveTrackInstrumentCtx(track, activeTracks), pitch, velocity, durationMs, 'PREVIEW')) {
+        window.SonicSF.playNote(pitch, velocity, durationMs, context.currentTime, program, destNode, prevCh, track ? track.synth_engine : undefined);
+      }
       return;
     }
     window.SonicSF.playNote(
@@ -22287,7 +22298,7 @@ const App = () => {
     }
     setTimeout(() => {
       window.SonicSF.stopAll();
-      stopAllNativeSfNotes();
+      _panicMidi();
       if (prTNode && prTNode.gainNode) {
         const prTrackData = activeTracksRef.current ? activeTracksRef.current.find(t => t.id === prSt.trackId) : null;
         const prVolDb = prTrackData ? (prTrackData.volumeDb ?? 0) : 0;
@@ -22327,7 +22338,7 @@ const App = () => {
     // tick vẫn thấy heldCnt > 0 → giữ peak → VU dính mãi (user bug 08:08).
     try { heldMidiNotesRef.current = {}; } catch (e) { }
     stopMidiCapture();
-    stopAllNativeSfNotes();
+    _panicMidi();
     if (window.SonicSF) {
       try { window.SonicSF.stopAll(); } catch (e) { console.warn('[Stop] stopAll error:', e); }
       // Dừng triệt để: noteoff từng note + hủy scheduled note-on (hết âm stuck)
@@ -22351,7 +22362,7 @@ const App = () => {
       if (st.isPlaying) {
         stopAllPlayback();
         window.SonicSF.stopAll();
-        stopAllNativeSfNotes();
+        _panicMidi();
         setSubTabs(prev => prev.map(s => s.id === activeTab ? {
           ...s,
           currentTime: time,
@@ -29919,7 +29930,7 @@ STRICT CONSTRAINTS:
                    }
                    setTimeout(() => {
                      window.SonicSF.stopAll();
-                     stopAllNativeSfNotes();
+                     _panicMidi();
                      if (tNode && tNode.gainNode) {
                        const trackData = activeTracksRef.current ? activeTracksRef.current.find(t => t.id === playingSub.trackId) : null;
                        const volDb = trackData ? (trackData.volumeDb ?? 0) : 0;
@@ -29940,7 +29951,7 @@ STRICT CONSTRAINTS:
                  if (seekSt.isPlaying) {
                    stopAllPlayback();
                    window.SonicSF.stopAll();
-                   stopAllNativeSfNotes();
+                   _panicMidi();
                    setSubTabs(prev => prev.map(s => s.id === seekSt.id ? { ...s, currentTime: clickTime, isPlaying: true } : s));
                    const ctx = getAudioContext();
                    startOffsetTimeRef.current = clickTime;

app/static/js/services/trackInstrument.js

@@ -0,0 +1,54 @@
+// SonicForge TrackInstrument Service
+// Bọc FluidSynth channel per-track: playNote/noteOff theo TrackInstrumentCtx
+// (ch/program/synthEngine/sfId/bank/prog/dest) — dùng cho preview mọi nguồn
+// (keybed, piano roll, draw, hardware MIDI, click) qua UnifiedMidiRouter.
+// Tạo mới mỗi note-on (overwrite registry) — voice cũ giữ engine cũ trong
+// tracker nên note-off luôn stop đúng channel.
+window.TrackInstrument = window.TrackInstrument || {};
+
+(function () {
+    function TrackInstrument(trackId, ctx) {
+        this.trackId = trackId;
+        this.ch = ctx ? (ctx.ch != null ? ctx.ch : 0) : 0;
+        this.program = ctx ? ctx.program : undefined;
+        this.synthEngine = ctx ? ctx.synthEngine : undefined;
+        this.sfId = ctx ? ctx.sfId : undefined;
+        this.bank = ctx ? (ctx.bank || 0) : 0;
+        this.prog = ctx ? (ctx.prog || 0) : 0;
+        this.dest = ctx ? (ctx.dest || null) : null;
+    }
+
+    // Đảm bảo channel đã select đúng instrument trước khi play (fire-and-forget:
+    // playNote tự load + retry nếu SF chưa load xong — dedup trong loadSoundFont).
+    TrackInstrument.prototype._ensure = function () {
+        try {
+            if (!window.SonicSF || !window.SonicSF.selectInstrument) return;
+            if (this.sfId) {
+                window.SonicSF.selectInstrument(this.ch, this.bank, this.prog, this.sfId);
+            } else if (this.program !== undefined) {
+                window.SonicSF.selectInstrument(this.ch, 0, this.program, null);
+            }
+        } catch (e) {
+            console.warn('[TrackInstrument] selectInstrument error:', e);
+        }
+    };
+
+    TrackInstrument.prototype.playNote = function (pitch, velocity, durationMs) {
+        try {
+            if (!window.SonicSF || !window.SonicSF.playNote) return;
+            this._ensure();
+            var dur = (durationMs != null ? durationMs : 500) || 500;
+            window.SonicSF.playNote(pitch, velocity != null ? velocity : 0.8, dur, undefined, this.program, this.dest, this.ch, this.synthEngine);
+        } catch (e) {
+            console.warn('[TrackInstrument] playNote error:', e);
+        }
+    };
+
+    TrackInstrument.prototype.noteOff = function (pitch) {
+        try {
+            if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(this.ch, pitch);
+        } catch (e) {}
+    };
+
+    window.TrackInstrument = TrackInstrument;
+})();

app/templates/index.html

@@ -36,6 +36,8 @@
     <script src="/static/js/services/runtime.js?v=202608111230"></script>
     <script src="/static/js/services/api.js?v=202608111230"></script>
     <script src="/static/js/services/vstiAutosample.js?v=202608111230"></script>
+    <script src="/static/js/services/unifiedMidiRouter.js?v=202608111230"></script>
+    <script src="/static/js/services/trackInstrument.js?v=202608111230"></script>
     <script src="/static/js/services/audioEngine.js?v=202607271016"></script>
     <script src="/static/js/services/storage.js?v=202608038200"></script>
     <script src="/static/js/services/soundfontStorage.js?v=202607271016"></script>