feat: vẽ section item canvas

app/static/js/app.jsx

@@ -677,7 +677,7 @@ const WaveformLane = ({
     // Draw sections
     const sections = track.sections || [];
     sections.forEach(sec => {
-      const secStartLocal = sec.start * zoom - scrollLeft;
+      const secStartLocal = sec.start * zoom - scrollLeft; // use secStartLocal NOT secStart
       const secWidth = sec.duration * zoom;
       if (secStartLocal + secWidth < 0 || secStartLocal > drawWidth) return;
       ctx.fillStyle = sec.color ? sec.color + '44' : 'rgba(6, 182, 212, 0.25)';
@@ -690,6 +690,67 @@ const WaveformLane = ({
       ctx.fillStyle = '#e4e4e7';
       ctx.font = 'bold 9px sans-serif';
       ctx.fillText(sec.name || 'Section', Math.max(secStartLocal + 4, 4), 14);
+
+      // Draw sub-tracks within section
+      const subTracks = sec.tracks || [];
+      const subTrackCount = Math.min(subTracks.length, 4);
+      const subTrackHeight = (height - 20) / Math.max(1, subTrackCount);
+      const subColors = ['#fbbf24', '#a78bfa', '#ec4899', '#10b981'];
+      for (let stIdx = 0; stIdx < subTrackCount; stIdx++) {
+        const sub = subTracks[stIdx];
+        if (!sub) continue;
+        const subY = 20 + stIdx * subTrackHeight;
+        ctx.fillStyle = sub.color ? sub.color + '22' : subColors[stIdx] + '22';
+        ctx.fillRect(secStartLocal + 1, subY, secWidth - 2, subTrackHeight - 1);
+        // Draw clips as waveform bars
+        const subClips = sub.clips || [];
+        subClips.forEach(cl => {
+          if (!cl.buffer) return;
+          const sr = cl.buffer.sampleRate;
+          const bufData = cl.buffer.getChannelData(0);
+          const bufLen = bufData.length;
+          const clStartLocal = cl.startTime || 0;
+          const clDurLocal = bufLen / sr / (cl.speed || 1.0);
+          const clStartMain = secStartLocal + clStartLocal * zoom;
+          const clW = Math.max(1, clDurLocal * zoom);
+          const peakSamples = Math.max(10, Math.min(100, Math.floor(clW / 3)));
+          const step = Math.max(1, Math.floor(bufLen / peakSamples));
+          for (let p = 0; p < peakSamples; p++) {
+            const sIdx = p * step;
+            let maxVal = 0;
+            for (let j = 0; j < step && sIdx + j < bufLen; j++) {
+              const abs = Math.abs(bufData[sIdx + j]);
+              if (abs > maxVal) maxVal = abs;
+            }
+            const bx = clStartMain + (p / peakSamples) * clW;
+            const barH = Math.max(1, maxVal * (subTrackHeight * 0.7));
+            const barY = subY + (subTrackHeight - barH) / 2;
+            ctx.fillStyle = subColors[stIdx] + '99';
+            ctx.fillRect(bx, barY, Math.max(1, clW / peakSamples), barH);
+          }
+        });
+        // Draw MIDI items as colored note bars
+        const subMidi = sub.midiItems || [];
+        subMidi.forEach(item => {
+          const itemStartLocal = secStartLocal + (item.startTime || 0) * zoom;
+          const itemDurLocal = (item.duration || 1) * zoom;
+          const notes = item.notes || [];
+          const pitchMin = 36;
+          const pitchMax = 84;
+          notes.forEach(note => {
+            const beatSec = 60.0 / (parseInt(bpm) || 120);
+            const noteStartSec = (note.start_beat || 0) * beatSec;
+            const noteDurSec = Math.max(0.02, (note.duration_beats || 0.25) * beatSec);
+            const noteStartLocal = itemStartLocal + noteStartSec * zoom;
+            const nw = noteDurSec * zoom;
+            const pitchFrac = Math.max(0, Math.min(1, (note.pitch - pitchMin) / (pitchMax - pitchMin)));
+            const ny = subY + 2 + (1.0 - pitchFrac) * (subTrackHeight - 6);
+            const nh = Math.max(4, (subTrackHeight - 6) / (pitchMax - pitchMin) * 3);
+            ctx.fillStyle = subColors[stIdx] + 'cc';
+            ctx.fillRect(Math.max(noteStartLocal, secStartLocal + 2), ny, Math.max(2, nw), nh);
+          });
+        });
+      }
     });
 
     // Draw MIDI items
@@ -4371,6 +4432,47 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
   const [draggedNote, setDraggedNote] = React.useState(null); // { mode: 'move'|'resize', idx, startOffsetBeat, originalStart }
   const [hoveredResizeIdx, setHoveredResizeIdx] = React.useState(-1);
 
+  // Undo/redo stacks
+  const undoStackRef = React.useRef([]);
+  const redoStackRef = React.useRef([]);
+  const notesBeforeDragRef = React.useRef(null);
+
+  const pushToUndo = React.useCallback((prevNotes) => {
+    undoStackRef.current.push(JSON.parse(JSON.stringify(prevNotes)));
+    redoStackRef.current = [];
+    if (undoStackRef.current.length > 50) undoStackRef.current.shift();
+  }, []);
+
+  const handleUndo = React.useCallback(() => {
+    const prev = undoStackRef.current.pop();
+    if (!prev) return;
+    redoStackRef.current.push(JSON.parse(JSON.stringify(notes)));
+    setNotes(prev);
+    setSelectedNoteIds([]);
+  }, [notes]);
+
+  const handleRedo = React.useCallback(() => {
+    const next = redoStackRef.current.pop();
+    if (!next) return;
+    undoStackRef.current.push(JSON.parse(JSON.stringify(notes)));
+    setNotes(next);
+    setSelectedNoteIds([]);
+  }, [notes]);
+
+  React.useEffect(() => {
+    const handler = e => {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'z' && !e.shiftKey) {
+        e.preventDefault();
+        handleUndo();
+      } else if ((e.ctrlKey || e.metaKey) && (e.key === 'y' || (e.key === 'z' && e.shiftKey))) {
+        e.preventDefault();
+        handleRedo();
+      }
+    };
+    window.addEventListener('keydown', handler);
+    return () => window.removeEventListener('keydown', handler);
+  }, [handleUndo, handleRedo]);
+
   React.useEffect(() => {
     onUpdateNotes(st.id, notes);
   }, [notes]);
@@ -4644,6 +4746,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
         return pitch === n.pitch && beat >= n.start_beat && beat < n.start_beat + n.duration_beats;
       });
       if (clickedNote) {
+        pushToUndo(notes);
         setNotes(prev => prev.filter(n => n.id !== clickedNote.id));
         setSelectedNoteIds(prev => prev.filter(id => id !== clickedNote.id));
         showToast('Đã xóa nốt nhanh!', 'info');
@@ -4659,33 +4762,35 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
     });
 
     // Click on note → play note with SoundFont
-    if (clickedNoteIdx !== -1 && !e.ctrlKey && !e.shiftKey) {
+    if (clickedNoteIdx !== -1 && !e.ctrlKey && !e.shiftKey && !e.altKey) {
       if (window.SonicSF) {
         const ctx = getAudioContext();
         window.SonicSF.playNote(notes[clickedNoteIdx].pitch, 100, 300, ctx.currentTime, st.instrumentProgram, null);
       }
     }
 
-    // Ctrl+click: selection mode (select notes by touching)
-    if (e.ctrlKey) {
+    // Ctrl+click: duplicate or selection
+    if (e.ctrlKey && !e.altKey) {
       if (clickedNoteIdx !== -1) {
-        // Ctrl+click on note: toggle selection
+        pushToUndo(notes);
         const clickedNote = notes[clickedNoteIdx];
-        if (selectedNoteIds.includes(clickedNote.id)) {
-          setSelectedNoteIds(prev => prev.filter(id => id !== clickedNote.id));
-        } else {
-          setSelectedNoteIds(prev => [...prev, clickedNote.id]);
-        }
-        // Start drag to select more notes
-        const selectedNotesOffset = notes
-          .filter(n => selectedNoteIds.includes(n.id) || n.id === notes[clickedNoteIdx].id)
-          .map(n => ({ id: n.id, originalStartBeat: n.start_beat, originalPitch: n.pitch }));
+        // Duplicate: clone all selected notes + clicked note
+        const idsToClone = [...new Set([...selectedNoteIds, clickedNote.id])];
+        const clones = notes.filter(n => idsToClone.includes(n.id)).map(n => ({
+          ...JSON.parse(JSON.stringify(n)),
+          id: 'note_' + Date.now() + Math.random().toString(36).substr(2, 8)
+        }));
+        setNotes(prev => [...prev, ...clones]);
+        const cloneIds = clones.map(c => c.id);
+        setSelectedNoteIds(cloneIds);
+        notesBeforeDragRef.current = JSON.parse(JSON.stringify(notes));
+        const cloneOffsets = clones.map(n => ({ id: n.id, originalStartBeat: n.start_beat, originalPitch: n.pitch }));
         setDraggedNote({
           mode: 'move',
-          idx: clickedNoteIdx,
-          startOffsetBeat: beat - notes[clickedNoteIdx].start_beat,
-          startOffsetPitch: pitch - notes[clickedNoteIdx].pitch,
-          selectedNotesOffset: selectedNotesOffset
+          idx: -1,
+          startOffsetBeat: beat,
+          startOffsetPitch: pitch,
+          selectedNotesOffset: cloneOffsets
         });
       } else {
         // Ctrl+click on empty space: start selection marquee
@@ -4698,8 +4803,28 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
       return;
     }
 
-    // Hovered resize edge
+    // Hovered resize edge (Alt+resize for scaling)
+    if (hoveredResizeIdx !== -1 && e.altKey) {
+      pushToUndo(notes);
+      notesBeforeDragRef.current = JSON.parse(JSON.stringify(notes));
+      const allSelected = [...new Set(selectedNoteIds.length > 0 ? selectedNoteIds : [notes[hoveredResizeIdx].id])];
+      const selectedNotes = notes.filter(n => allSelected.includes(n.id));
+      const firstStart = Math.min(...selectedNotes.map(n => n.start_beat));
+      const draggedNote = notes[hoveredResizeIdx];
+      setDraggedNote({
+        mode: 'scale',
+        idx: hoveredResizeIdx,
+        originalEnd: draggedNote.start_beat + draggedNote.duration_beats,
+        firstStart: firstStart,
+        selectedNoteIds: allSelected
+      });
+      return;
+    }
+
+    // Hovered resize edge (normal resize)
     if (hoveredResizeIdx !== -1) {
+      pushToUndo(notes);
+      notesBeforeDragRef.current = JSON.parse(JSON.stringify(notes));
       setDraggedNote({
         mode: 'resize',
         idx: hoveredResizeIdx,
@@ -4711,15 +4836,22 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
     if (clickedNoteIdx !== -1) {
       // Click on existing note: drag-move
       const clickedNote = notes[clickedNoteIdx];
+      let nextSelectedIds;
       if (!selectedNoteIds.includes(clickedNote.id)) {
         if (e.shiftKey) {
-          setSelectedNoteIds(prev => [...prev, clickedNote.id]);
+          nextSelectedIds = [...selectedNoteIds, clickedNote.id];
+          setSelectedNoteIds(nextSelectedIds);
         } else {
-          setSelectedNoteIds([clickedNote.id]);
+          nextSelectedIds = [clickedNote.id];
+          setSelectedNoteIds(nextSelectedIds);
         }
+      } else {
+        nextSelectedIds = selectedNoteIds;
       }
+      pushToUndo(notes);
+      notesBeforeDragRef.current = JSON.parse(JSON.stringify(notes));
       const selectedNotesOffset = notes
-        .filter(n => selectedNoteIds.includes(n.id) || n.id === clickedNote.id)
+        .filter(n => nextSelectedIds.includes(n.id))
         .map(n => ({
           id: n.id,
           originalStartBeat: n.start_beat,
@@ -4733,7 +4865,8 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
         selectedNotesOffset: selectedNotesOffset
       });
     } else {
-      // Click on empty space: DRAW a new note starting from click position
+      // Click on empty space: DRAW a new note (brush mode with visitedPitches)
+      pushToUndo(notes);
       const start = getSnapBeat(beat, snapVal);
       const initialDur = getSnapDuration(snapVal);
       const noteId = 'note_' + Date.now() + Math.random().toString(36).substr(2, 5);
@@ -4753,7 +4886,10 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
         startOffsetBeat: start,
         startOffsetPitch: pitch,
         drawNoteId: noteId,
-        drawDuration: initialDur
+        drawDuration: initialDur,
+        visitedPitches: [pitch],
+        initialBeat: start,
+        initialPitch: pitch
       });
       // Play the note with SoundFont
       if (window.SonicSF) {
@@ -4823,6 +4959,47 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
         if (n.id !== draggedNote.drawNoteId) return n;
         return { ...n, duration_beats: newDur };
       }));
+      // Brush: track visited pitches and create evenly-spaced notes
+      const visited = draggedNote.visitedPitches || [];
+      if (!visited.includes(pitch)) {
+        const newPitches = [...visited, pitch];
+        const totalSpan = Math.max(0.125, beat - draggedNote.initialBeat);
+        const perNoteDur = totalSpan / newPitches.length;
+        const brushIds = draggedNote.brushIds || [];
+        setNotes(prev => {
+          const cleaned = prev.filter(n => !brushIds.includes(n.id));
+          const brushNotes = newPitches.map((p, i) => ({
+            id: 'note_' + Date.now() + Math.random().toString(36).substr(2, 8) + '_' + i,
+            pitch: p,
+            start_beat: draggedNote.initialBeat + i * perNoteDur,
+            duration_beats: perNoteDur * 0.9,
+            velocity: 0.8,
+            pan: 0.0
+          }));
+          const newBrushIds = brushNotes.map(bn => bn.id);
+          setSelectedNoteIds(newBrushIds);
+          draggedNote.brushIds = newBrushIds;
+          draggedNote.visitedPitches = newPitches;
+          return [...cleaned, ...brushNotes];
+        });
+      }
+      return;
+    }
+    if (draggedNote.mode === 'scale') {
+      const newEnd = getSnapBeat(Math.max(draggedNote.firstStart + 0.125, beat), snapVal);
+      const scaleFactor = (newEnd - draggedNote.firstStart) / (draggedNote.originalEnd - draggedNote.firstStart);
+      const ids = draggedNote.selectedNoteIds || [];
+      const firstStart = draggedNote.firstStart;
+      setNotes(prev => prev.map(n => {
+        if (!ids.includes(n.id)) return n;
+        const relStart = n.start_beat - firstStart;
+        const relEnd = relStart + n.duration_beats;
+        return {
+          ...n,
+          start_beat: firstStart + relStart * scaleFactor,
+          duration_beats: Math.max(0.125, relEnd * scaleFactor - relStart * scaleFactor)
+        };
+      }));
       return;
     }
     if (draggedNote.mode === 'resize') {
@@ -5407,6 +5584,12 @@ const App = () => {
     if (id === 'export') setShowExportPanel(true); else if (id === 'ai') setShowAIPanel(true); else if (id === 'python_tools') setShowPythonToolsPanel(true); else if (id === 'selection') setShowSelectionPanel(true);
   };
   const [instrumentSelectorTrackId, setInstrumentSelectorTrackId] = useState(null);
+  const [fxSelectorTrackId, setFxSelectorTrackId] = useState(null);
+  const handleSetTrackFx = (trackId, fxType) => {
+    updateActiveTracks(prev => prev.map(t => t.id === trackId ? { ...t, fxType } : t));
+    setFxSelectorTrackId(null);
+    setTimeout(() => lucide.createIcons(), 50);
+  };
   const [instrumentSelectorData, setInstrumentSelectorData] = useState(null);
   const openInstrumentSelector = trackId => {
     setInstrumentSelectorTrackId(trackId);
@@ -5435,6 +5618,32 @@ const App = () => {
   const [synthCategory, setSynthCategory] = useState(null); // 'vst' | 'soundfont'
   const [selectedSoundFontId, setSelectedSoundFontId] = useState(null);
   const [sfPresets, setSfPresets] = useState(null); // presets from SoundFont
+  const [instrumentDropdownTrackId, setInstrumentDropdownTrackId] = useState(null);
+  const [instrumentDropdownBtnRect, setInstrumentDropdownBtnRect] = useState(null);
+  const [instrumentSearchQuery, setInstrumentSearchQuery] = useState('');
+  const filteredInstruments = useMemo(() => {
+    if (!instrumentSelectorData || !instrumentSearchQuery) return { soundfonts: instrumentSelectorData?.soundfonts || [], vst: instrumentSelectorData?.vst_instruments || [] };
+    const q = instrumentSearchQuery.toLowerCase();
+    return {
+      soundfonts: (instrumentSelectorData.soundfonts || []).filter(sf => (sf.display || sf.name || sf.id).toLowerCase().includes(q)),
+      vst: (instrumentSelectorData.vst_instruments || []).filter(v => (v.name || v.id).toLowerCase().includes(q))
+    };
+  }, [instrumentSearchQuery, instrumentSelectorData]);
+  useEffect(() => {
+    if (!instrumentSelectorData) {
+      window.SonicAPI.listPlugins().then(data => setInstrumentSelectorData(data)).catch(() => {});
+    }
+  }, []);
+  useEffect(() => {
+    if (!instrumentDropdownTrackId) return;
+    const handler = e => {
+      setInstrumentDropdownTrackId(null);
+      setInstrumentDropdownBtnRect(null);
+      setInstrumentSearchQuery('');
+    };
+    document.addEventListener('click', handler);
+    return () => document.removeEventListener('click', handler);
+  }, [instrumentDropdownTrackId]);
   const GM_INSTRUMENTS = [
     "Acoustic Grand Piano","Bright Acoustic Piano","Electric Grand Piano","Honky-tonk Piano","Electric Piano 1","Electric Piano 2","Harpsichord","Clavi",
     "Celesta","Glockenspiel","Music Box","Vibraphone","Marimba","Xylophone","Tubular Bells","Dulcimer",
@@ -5458,12 +5667,16 @@ const App = () => {
       if (t.id !== trackId) return t;
       return { ...t, instrumentId, instrumentProgram: programNumber !== undefined ? programNumber : undefined, instrumentName: displayName };
     }));
+    setInstrumentDropdownTrackId(null);
+    setInstrumentDropdownBtnRect(null);
     setInstrumentSelectorTrackId(null);
     setSynthCategory(null);
     setSelectedSoundFontId(null);
     setTimeout(() => lucide.createIcons(), 50);
   };
   const setTrackInstrument = (trackId, instrumentId, displayName) => {
+    setInstrumentDropdownTrackId(null);
+    setInstrumentDropdownBtnRect(null);
     if (instrumentId && instrumentId.startsWith('sf_')) {
       // Set instrument on track immediately so Synth button shows the name
       updateActiveTracks(prev => prev.map(t => {
@@ -5605,6 +5818,7 @@ const App = () => {
   const [showFxRack, setShowFxRack] = useState(false);
   const [showMidiEvents, setShowMidiEvents] = useState(false);
   const [rightSidebarWidth, setRightSidebarWidth] = useState(320);
+  const [tcpWidth, setTcpWidth] = useState(320);
   const [mediaExplorerHeight, setMediaExplorerHeight] = useState(50);
   const [panelPositions, setPanelPositions] = useState({
     export: 'bottom',
@@ -6072,6 +6286,24 @@ const App = () => {
     document.addEventListener('mouseup', onUp);
   };
 
+  // ── TCP Resizer ──
+  const startTcpResize = e => {
+    e.preventDefault();
+    const startX = e.clientX;
+    const startWidth = tcpWidth;
+    const onMove = ev => {
+      const deltaX = ev.clientX - startX;
+      const newWidth = Math.max(280, Math.min(600, startWidth + deltaX));
+      setTcpWidth(newWidth);
+    };
+    const onUp = () => {
+      document.removeEventListener('mousemove', onMove);
+      document.removeEventListener('mouseup', onUp);
+    };
+    document.addEventListener('mousemove', onMove);
+    document.addEventListener('mouseup', onUp);
+  };
+
   // ── Right Sidebar Row Resizer (Media Explorer / AI Panel) ──
   const startRowResize = e => {
     e.preventDefault();
@@ -6851,17 +7083,19 @@ const App = () => {
     const secondsPerBar = secondsPerBeat * 4;
     const durationSec = (tab.length_bars || 16.0) * secondsPerBar;
 
+    const contentTracks = tab.tracks ? tab.tracks.filter(tr => tr.clips?.length > 0 || tr.midiItems?.length > 0) : [];
+
     setTracks(prev => prev.map(t => {
       if (!t.sections || t.sections.length === 0) return t;
       return {
         ...t,
         sections: t.sections.map(s => {
-          if (s.sectionId !== tab.sectionId) return s;
+          if (s.sectionId !== tab.sectionId && s.id !== tab.sectionId) return s;
           return {
             ...s,
             name: tab.name,
             duration: durationSec,
-            tracks: tab.tracks
+            tracks: contentTracks
           };
         })
       };
@@ -6883,7 +7117,7 @@ const App = () => {
     if (existing) { setActiveTab(existing.id); showToast(`Tab "${section.name}" already open.`, 'info'); return; }
     const tabId = 'session_' + Date.now();
     const tabName = section.name || 'Section';
-    const clonedTracks = section.tracks ? section.tracks : tracks.map(t => ({
+    const clonedTracks = section.tracks ? JSON.parse(JSON.stringify(section.tracks)) : tracks.filter(t => t.id === trackId).map(t => ({
       ...t,
       clips: [],
       sections: [],
@@ -8472,6 +8706,53 @@ const App = () => {
     return () => cancelAnimationFrame(animationFrameIdRef.current);
   }, [isPlaying, subTabs, isLoopingSelection, selLeft, selRight, selectionMode, localSelectionTrackId, selectionCleared, activeTab]);
 
+  // ── FX Nodes ──
+  const createChorusNode = (context, inputNode, outputNode) => {
+    const dryGain = context.createGain();
+    dryGain.gain.value = 0.6;
+    const wetGain = context.createGain();
+    wetGain.gain.value = 0.5;
+    const delayNode = context.createDelay();
+    delayNode.delayTime.value = 0.02;
+    const lfo = context.createOscillator();
+    lfo.type = 'sine';
+    lfo.frequency.value = 1.5;
+    const lfoGain = context.createGain();
+    lfoGain.gain.value = 0.002;
+    lfo.connect(lfoGain);
+    lfoGain.connect(delayNode.delayTime);
+    lfo.start();
+    inputNode.connect(dryGain);
+    inputNode.connect(delayNode);
+    delayNode.connect(wetGain);
+    dryGain.connect(outputNode);
+    wetGain.connect(outputNode);
+    return { stop: () => { try { lfo.stop(); } catch(e) {} } };
+  };
+  const createReverbNode = (context, inputNode, outputNode) => {
+    const dryGain = context.createGain();
+    dryGain.gain.value = 0.6;
+    const wetGain = context.createGain();
+    wetGain.gain.value = 0.4;
+    const convolver = context.createConvolver();
+    const rate = context.sampleRate;
+    const len = rate * 2.0;
+    const impulse = context.createBuffer(2, len, rate);
+    const left = impulse.getChannelData(0);
+    const right = impulse.getChannelData(1);
+    for (let i = 0; i < len; i++) {
+      const decay = Math.exp(-i / (rate * 0.5));
+      left[i] = (Math.random() * 2 - 1) * decay;
+      right[i] = (Math.random() * 2 - 1) * decay;
+    }
+    convolver.buffer = impulse;
+    inputNode.connect(dryGain);
+    inputNode.connect(convolver);
+    convolver.connect(wetGain);
+    dryGain.connect(outputNode);
+    wetGain.connect(outputNode);
+  };
+
   // ── Playback ──
   const getOrCreateTrackNode = (track, context) => {
     if (!track) return null;
@@ -8484,12 +8765,41 @@ const App = () => {
       const pannerNode = context.createStereoPanner();
       pannerNode.pan.setValueAtTime((track.pan ?? 0) / 100, context.currentTime);
       pannerNode.connect(context.destination);
-      gainNode.connect(pannerNode);
-      node = { gainNode, pannerNode };
+      let fxStopFn;
+      if (track.fxType === 'chorus') {
+        const fxInput = context.createGain();
+        gainNode.connect(fxInput);
+        const chorus = createChorusNode(context, fxInput, pannerNode);
+        fxStopFn = chorus.stop;
+      } else if (track.fxType === 'reverb') {
+        const fxInput = context.createGain();
+        gainNode.connect(fxInput);
+        createReverbNode(context, fxInput, pannerNode);
+        fxStopFn = null;
+      } else {
+        gainNode.connect(pannerNode);
+      }
+      node = { gainNode, pannerNode, fxStopFn };
       activeTrackNodesRef.current[track.id] = node;
     }
     return node.gainNode;
   };
+  const getOrCreateSubTrackNode = (track, subTrack, context) => {
+    if (!track || !subTrack) return null;
+    const subKey = track.id + '_sub_' + subTrack.id;
+    let node = activeTrackNodesRef.current[subKey];
+    if (!node) {
+      const gainNode = context.createGain();
+      const volDb = subTrack.volumeDb ?? 0;
+      const volLinear = volDb <= -50 ? 0 : Math.pow(10, volDb / 20);
+      gainNode.gain.setValueAtTime(volLinear, context.currentTime);
+      const parentNode = getOrCreateTrackNode(track, context);
+      gainNode.connect(parentNode);
+      node = { gainNode, pannerNode: null };
+      activeTrackNodesRef.current[subKey] = node;
+    }
+    return node.gainNode;
+  };
 
   const playMidiPreviewNote = (pitch, velocity = 0.8, durationMs = 500) => {
     if (!window.SonicSF) return;
@@ -8611,6 +8921,9 @@ const App = () => {
             const isSubPlayable = hasSubSolo ? subTrack.solo : !subTrack.muted;
             if (!isSubPlayable) return;
 
+            const subNode = getOrCreateSubTrackNode(track, subTrack, context);
+            if (!subNode) return;
+
             // 1. Play clips in subTrack
             const subClips = subTrack.clips || [];
             subClips.forEach(clip => {
@@ -8630,7 +8943,7 @@ const App = () => {
                 const source = context.createBufferSource();
                 source.buffer = clip.buffer;
                 source.playbackRate.value = clip.speed || 1.0;
-                source.connect(gainNode);
+                source.connect(subNode);
 
                 if (offsetTime < activeStart) {
                   const delay = activeStart - offsetTime;
@@ -8674,7 +8987,7 @@ const App = () => {
                         playDurMs,
                         startTime,
                         program,
-                        gainNode
+                        subNode
                       );
                     } else {
                       const remainingDurMs = (notePlayEndMain - offsetTime) * 1000;
@@ -8684,7 +8997,7 @@ const App = () => {
                         remainingDurMs,
                         context.currentTime,
                         program,
-                        gainNode
+                        subNode
                       );
                     }
                   }
@@ -8864,6 +9177,9 @@ const App = () => {
       } catch (e) { }
     });
     activeSourcesRef.current = [];
+    Object.values(activeTrackNodesRef.current).forEach(n => {
+      if (n.fxStopFn) n.fxStopFn();
+    });
     activeTrackNodesRef.current = {};
     if (window.SonicSF) {
       window.SonicSF.stopAll();
@@ -13799,8 +14115,9 @@ const App = () => {
     }, activeTab === 'main' || sessionTabs.some(s => s.id === activeTab) ? /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("div", {
       ref: tcpContainerRef,
       onScroll: handleTCPScroll,
-      className: "w-[320px] shrink-0 z-20 bg-[#262626] overflow-y-auto flex flex-col border-r border-zinc-900 no-scrollbar",
+      className: "shrink-0 z-20 bg-[#262626] overflow-y-auto flex flex-col border-r border-zinc-900 no-scrollbar",
       style: {
+        width: tcpWidth + 'px',
         scrollbarWidth: 'none',
         msOverflowStyle: 'none'
       }
@@ -13991,10 +14308,10 @@ const App = () => {
         title: "ARM (Record)",
         className: `px-1.5 py-0.5 text-[10px] rounded font-mono font-bold border transition flex items-center gap-0.5 ${track.isArmed ? 'bg-red-600 text-white border-red-500 hover:bg-red-500' : 'bg-zinc-800 text-zinc-400 border-transparent hover:text-zinc-200'}`
       }, /*#__PURE__*/React.createElement("i", { "data-lucide": "circle", className: `w-2.5 h-2.5 ${track.isArmed ? 'fill-white' : ''}` })), /*#__PURE__*/React.createElement("button", {
-        onClick: e => { e.stopPropagation(); openInstrumentSelector(track.id); },
+        onClick: e => { e.stopPropagation(); const btn = e.currentTarget; setInstrumentDropdownTrackId(prev => prev === track.id ? null : track.id); setInstrumentDropdownBtnRect(btn.getBoundingClientRect()); setInstrumentSearchQuery(''); },
         title: track.instrumentName || track.instrumentId || "Synth",
-        className: `px-1.5 py-0.5 text-[10px] rounded font-mono font-bold border transition flex items-center gap-0.5 ${track.instrumentId ? 'bg-violet-900 text-violet-300 border-violet-700' : 'bg-zinc-800 text-zinc-500 border-transparent hover:text-zinc-300'}`
-      }, /*#__PURE__*/React.createElement("i", { "data-lucide": "music", className: "w-3 h-3" })), /*#__PURE__*/React.createElement("button", {
+        className: `px-1.5 py-0.5 text-[10px] rounded font-mono font-bold border transition flex items-center gap-0.5 max-w-[60px] ${track.instrumentId ? 'bg-violet-900 text-violet-300 border-violet-700' : 'bg-zinc-800 text-zinc-500 border-transparent hover:text-zinc-300'}`
+      }, /*#__PURE__*/React.createElement("i", { "data-lucide": "music", className: "w-3 h-3 shrink-0" }), /*#__PURE__*/React.createElement("span", { className: "truncate text-[9px]" }, track.instrumentName || track.instrumentId || (instrumentDropdownTrackId === track.id ? '' : 'Synth')), /*#__PURE__*/React.createElement("i", { "data-lucide": "chevron-down", className: "w-2.5 h-2.5 shrink-0" })), /*#__PURE__*/React.createElement("button", {
         onClick: e => {
           e.stopPropagation();
           toggleTrackMonitor(track.id);
@@ -14109,10 +14426,7 @@ const App = () => {
         "data-lucide": "upload",
         className: "w-3 h-3"
       })), " File"), /*#__PURE__*/React.createElement("button", {
-        onClick: e => {
-          e.stopPropagation();
-          showToast('FX panel for track ' + track.id, 'info');
-        },
+        onClick: e => { e.stopPropagation(); setFxSelectorTrackId(track.id); },
         className: "px-2.5 py-1 bg-zinc-800 hover:bg-zinc-700 text-purple-400 border border-purple-900 rounded text-xs font-bold flex items-center gap-1"
       }, /*#__PURE__*/React.createElement("span", {
         className: "inline-flex items-center shrink-0"
@@ -14121,17 +14435,15 @@ const App = () => {
         className: "w-3 h-3"
       })), " FX: ", /*#__PURE__*/React.createElement("span", {
         className: "text-zinc-500 font-normal"
-      }, " None")), /*#__PURE__*/React.createElement("button", {
-        onClick: (e) => { e.stopPropagation(); openInstrumentSelector(track.id); },
-        className: "px-2.5 py-1 bg-zinc-800 hover:bg-zinc-700 text-amber-400 border border-amber-800 rounded text-xs font-bold flex items-center gap-1"
+      }, track.fxType || "None")), /*#__PURE__*/React.createElement("button", {
+        onClick: (e) => { e.stopPropagation(); const btn = e.currentTarget; setInstrumentDropdownTrackId(prev => prev === track.id ? null : track.id); setInstrumentDropdownBtnRect(btn.getBoundingClientRect()); setInstrumentSearchQuery(''); },
+        className: "px-2.5 py-1 bg-zinc-800 hover:bg-zinc-700 text-amber-400 border border-amber-800 rounded text-xs font-bold flex items-center gap-1 max-w-[120px]"
       }, /*#__PURE__*/React.createElement("span", {
         className: "inline-flex items-center shrink-0"
       }, /*#__PURE__*/React.createElement("i", {
         "data-lucide": "music",
         className: "w-3 h-3"
-      })), " Synth: ", /*#__PURE__*/React.createElement("span", {
-        className: "text-zinc-500 font-normal"
-      }, track.instrumentName || track.instrumentId || "None"))), /*#__PURE__*/React.createElement("div", {
+      })), /*#__PURE__*/React.createElement("span", { className: "truncate text-[10px]" }, track.instrumentName || track.instrumentId || "Synth"), /*#__PURE__*/React.createElement("i", { "data-lucide": "chevron-down", className: "w-3 h-3 shrink-0" }))), /*#__PURE__*/React.createElement("div", {
         onMouseDown: e => handleTrackResizeMouseDown(e, track.id),
         className: "absolute bottom-0 left-0 right-0 h-1 cursor-ns-resize z-30 hover:bg-cyan-500/50 transition-colors",
         onClick: e => e.stopPropagation()
@@ -14139,6 +14451,9 @@ const App = () => {
     })), /*#__PURE__*/React.createElement("div", {
       className: "h-[48px] border-r border-zinc-900 bg-[#1e1e1e]/50 shrink-0"
     })), /*#__PURE__*/React.createElement("div", {
+      className: "w-1 cursor-ew-resize hover:bg-cyan-500/50 active:bg-cyan-400 transition-colors shrink-0 z-10",
+      onMouseDown: startTcpResize
+    }), /*#__PURE__*/React.createElement("div", {
       ref: handleTimelineWrapperRef,
       onScroll: handleTimelineScroll,
       className: "flex-1 relative z-10 overflow-x-auto overflow-y-auto min-w-0"
@@ -14354,13 +14669,14 @@ const App = () => {
       })() : (st.buffer && 'duration' in st.buffer ? st.buffer.duration : 4.0);
       const subTabTimelineWidth = Math.max(zoom * subTabDuration, viewportWidth);
       return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("div", {
-        className: "w-[320px] shrink-0 z-30 bg-[#262626] overflow-y-scroll no-scrollbar flex flex-col border-r border-zinc-900",
-        style: {
-          scrollbarWidth: 'none',
-          msOverflowStyle: 'none'
-        }
-      }, /*#__PURE__*/React.createElement("div", {
-        className: "sticky top-0 z-50 flex items-center h-10 border-b border-zinc-900 bg-[#242424] px-2 justify-between shrink-0"
+      className: "shrink-0 z-30 bg-[#262626] overflow-y-scroll no-scrollbar flex flex-col border-r border-zinc-900",
+      style: {
+        width: tcpWidth + 'px',
+        scrollbarWidth: 'none',
+        msOverflowStyle: 'none'
+      }
+    }, /*#__PURE__*/React.createElement("div", {
+      className: "sticky top-0 z-50 flex items-center h-10 border-b border-zinc-900 bg-[#242424] px-2 justify-between shrink-0"
       }, /*#__PURE__*/React.createElement("span", {
         className: "text-xs font-bold text-zinc-500 uppercase"
       }, "Sub-Tab"), /*#__PURE__*/React.createElement("button", {
@@ -14664,6 +14980,9 @@ const App = () => {
       })), " Save"))) : /*#__PURE__*/React.createElement("div", {
         className: "flex-1 flex items-center justify-center text-xs text-zinc-500"
       }, "Track not found")), /*#__PURE__*/React.createElement("div", {
+        className: "w-1 cursor-ew-resize hover:bg-cyan-500/50 active:bg-cyan-400 transition-colors shrink-0 z-10",
+        onMouseDown: startTcpResize
+      }), /*#__PURE__*/React.createElement("div", {
         ref: handleTimelineWrapperRef,
         className: "flex-1 relative z-10 overflow-x-auto overflow-y-auto min-w-0"
       }, /*#__PURE__*/React.createElement("div", {
@@ -15272,7 +15591,49 @@ const App = () => {
           /*#__PURE__*/React.createElement("p", { className: "text-xs text-zinc-500 py-4 text-center" }, "No plugins available. Upload SoundFont via Tools \u2192 Plugin Manager.")
       )
     )
-  ))));
+  ))), fxSelectorTrackId && /*#__PURE__*/React.createElement("div", {
+    className: "fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm",
+    onClick: () => setFxSelectorTrackId(null)
+  }, /*#__PURE__*/React.createElement("div", {
+    className: "bg-[#262626] border border-[#383838] rounded-xl shadow-2xl w-64 p-4 text-slate-200",
+    onClick: e => e.stopPropagation()
+  }, /*#__PURE__*/React.createElement("h3", { className: "text-sm font-bold text-purple-400 mb-3" }, "Track FX"), /*#__PURE__*/React.createElement("div", { className: "space-y-1" },
+    /*#__PURE__*/React.createElement("button", { onClick: () => handleSetTrackFx(fxSelectorTrackId, null), className: "w-full text-left px-3 py-2 text-xs rounded bg-zinc-800 hover:bg-zinc-700 text-zinc-400" }, "None"),
+    /*#__PURE__*/React.createElement("button", { onClick: () => handleSetTrackFx(fxSelectorTrackId, 'chorus'), className: "w-full text-left px-3 py-2 text-xs rounded bg-zinc-800 hover:bg-cyan-800 text-cyan-300" }, "Chorus"),
+    /*#__PURE__*/React.createElement("button", { onClick: () => handleSetTrackFx(fxSelectorTrackId, 'reverb'), className: "w-full text-left px-3 py-2 text-xs rounded bg-zinc-800 hover:bg-purple-800 text-purple-300" }, "Reverb")
+  ))), instrumentDropdownTrackId && instrumentDropdownBtnRect && /*#__PURE__*/React.createElement("div", {
+    "data-instr-dropdown": "",
+    className: "fixed z-[100] bg-[#1e1e1e] border border-zinc-700 rounded shadow-xl w-[220px] max-h-[300px] flex flex-col",
+    style: {
+      top: instrumentDropdownBtnRect.bottom + 4,
+      left: Math.max(4, Math.min(instrumentDropdownBtnRect.left, window.innerWidth - 224))
+    }
+  }, /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "T\u00ecm nh\u1ea1c c\u1ee5...",
+    value: instrumentSearchQuery,
+    onChange: e => setInstrumentSearchQuery(e.target.value),
+    autoFocus: true,
+    className: "w-full bg-black border-b border-zinc-700 px-2 py-1.5 text-xs outline-none"
+  }), /*#__PURE__*/React.createElement("div", { className: "flex-1 overflow-y-auto" },
+    /*#__PURE__*/React.createElement("button", {
+      onClick: () => setTrackInstrumentWithProgram(instrumentDropdownTrackId, null),
+      className: "w-full text-left px-3 py-1.5 text-xs bg-zinc-800 hover:bg-zinc-700 text-zinc-400"
+    }, "None (Default Synth)"),
+    filteredInstruments.soundfonts.length > 0 && /*#__PURE__*/React.createElement("div", { className: "text-[10px] text-zinc-500 px-3 py-1 mt-1 uppercase font-bold" }, "SoundFonts"),
+    filteredInstruments.soundfonts.map((sf, i) => /*#__PURE__*/React.createElement("button", {
+      key: "sfd_" + i,
+      onClick: () => { setInstrumentDropdownTrackId(null); setInstrumentDropdownBtnRect(null); setTrackInstrument(instrumentDropdownTrackId, "sf_" + sf.id, sf.display || sf.name || sf.id); },
+      className: "w-full text-left px-3 py-1.5 text-xs bg-zinc-800 hover:bg-amber-800 text-zinc-200 flex items-center justify-between"
+    }, /*#__PURE__*/React.createElement("span", { className: "truncate" }, sf.display || sf.name || sf.id), /*#__PURE__*/React.createElement("span", { className: "text-[10px] text-amber-400 shrink-0 ml-1" }, "SF"))),
+    filteredInstruments.vst.length > 0 && /*#__PURE__*/React.createElement("div", { className: "text-[10px] text-zinc-500 px-3 py-1 mt-1 uppercase font-bold" }, "VST Instruments"),
+    filteredInstruments.vst.map((v, i) => /*#__PURE__*/React.createElement("button", {
+      key: "vstd_" + i,
+      onClick: () => { setInstrumentDropdownTrackId(null); setInstrumentDropdownBtnRect(null); setTrackInstrumentWithProgram(instrumentDropdownTrackId, v.id, undefined, v.name || v.id); },
+      className: "w-full text-left px-3 py-1.5 text-xs bg-zinc-800 hover:bg-violet-800 text-zinc-200 flex items-center justify-between"
+    }, /*#__PURE__*/React.createElement("span", { className: "truncate" }, v.name || v.id), /*#__PURE__*/React.createElement("span", { className: "text-[10px] text-cyan-400 shrink-0 ml-1" }, v.type || "VST"))),
+    (!filteredInstruments.soundfonts.length && !filteredInstruments.vst.length) && /*#__PURE__*/React.createElement("p", { className: "text-xs text-zinc-500 py-4 text-center" }, "Kh\u00f4ng t\u00ecm th\u1ea5y nh\u1ea1c c\u1ee5 n\u00e0o")
+  )));
 };
 const root = ReactDOM.createRoot(document.getElementById('root'));
 root.render(/*#__PURE__*/React.createElement(App, null));

app/storage/soundfonts/3c4f0cfc-ecc4-4ae8-adeb-14c0d04d9e20.meta

@@ -0,0 +1 @@
+{"original_name": "test.sf2", "uuid": "3c4f0cfc-ecc4-4ae8-adeb-14c0d04d9e20", "file": "3c4f0cfc-ecc4-4ae8-adeb-14c0d04d9e20.sf2"}

app/storage/soundfonts/f5aa67a6-d998-4013-b61a-ff0b6adfe311.meta

@@ -0,0 +1 @@
+{"original_name": "test.sf2", "uuid": "f5aa67a6-d998-4013-b61a-ff0b6adfe311", "file": "f5aa67a6-d998-4013-b61a-ff0b6adfe311.sf2"}