diff --git a/app/static/js/app.jsx b/app/static/js/app.jsx
index f25f1c8..d8575d0 100644
--- a/app/static/js/app.jsx
+++ b/app/static/js/app.jsx
@@ -9025,13 +9025,27 @@ const MediaExplorerPanel = ({ height }) => {
   const [currentTime, setCurrentTime] = React.useState(0);
   const [peaks, setPeaks] = React.useState(null);
   const [audioBuffer, setAudioBuffer] = React.useState(null);
+  const [midiNotes, setMidiNotes] = React.useState(null);
+  const [midiTotal, setMidiTotal] = React.useState(4);
   const [computerRoots, setComputerRoots] = React.useState(null);
   const [computerTree, setComputerTree] = React.useState({});
   const [computerPath, setComputerPath] = React.useState(null);
   const [computerFiles, setComputerFiles] = React.useState([]);
   const [computerMode, setComputerMode] = React.useState('server');
   const [clientRoot, setClientRoot] = React.useState(null);
-  const [treeWidth, setTreeWidth] = React.useState(176);
+  const [synthInst, setSynthInst] = React.useState(function() {
+    var saved = localStorage.getItem('studio_media_explorer_synth');
+    return saved ? JSON.parse(saved) : null;
+  }());
+  const [synthOpen, setSynthOpen] = React.useState(false);
+  const [synthList, setSynthList] = React.useState(null);
+  const [synthLoading, setSynthLoading] = React.useState(false);
+  const synthListRef = React.useRef(null);
+  synthListRef.current = synthList;
+  const [treeWidth, setTreeWidth] = React.useState(function() {
+    var saved = localStorage.getItem('studio_media_explorer_tree_width');
+    return saved ? parseInt(saved) : 176;
+  }());
   const treeWidthRef = React.useRef(176);
   treeWidthRef.current = treeWidth;
   const startTreeResize = (e) => {
@@ -9039,11 +9053,14 @@ const MediaExplorerPanel = ({ height }) => {
     const startX = e.clientX;
     const startW = treeWidthRef.current;
     const onMove = (ev) => {
-      setTreeWidth(Math.max(110, Math.min(420, startW + (ev.clientX - startX))));
+      const newW = Math.max(110, Math.min(420, startW + (ev.clientX - startX)));
+      treeWidthRef.current = newW;
+      setTreeWidth(newW);
     };
     const onUp = () => {
       document.removeEventListener('mousemove', onMove);
       document.removeEventListener('mouseup', onUp);
+      localStorage.setItem('studio_media_explorer_tree_width', treeWidthRef.current.toString());
     };
     document.addEventListener('mousemove', onMove);
     document.addEventListener('mouseup', onUp);
@@ -9064,7 +9081,10 @@ const MediaExplorerPanel = ({ height }) => {
   const isMidiFile = f => f && (f.kind === 'midi' || /\.(mid|midi)$/i.test(f.name || f.original_name || ''));
   const fileDuration = f => {
     if (!f) return 0;
-    if (isMidiFile(f)) return (f.lengthQn || 16) * 60 / (f.bpm || 120);
+    if (isMidiFile(f)) {
+      if (midiTotal && midiNotes && midiNotes.length) return midiTotal;
+      return (f.lengthQn || 16) * 60 / (f.bpm || 120);
+    }
     const matches = selected && ((f.path && f.path === selected.path) || (!f.path && (f.file_id || f.fileId) === (selected.file_id || selected.fileId)));
     return f.duration || (audioBuffer && matches ? audioBuffer.duration : 0) || 0;
   };
@@ -9268,6 +9288,71 @@ const MediaExplorerPanel = ({ height }) => {
     return fid ? `${API_BASE_URL}/api/v1/audio/download/${fid}` : null;
   };
 
+  const toggleSynthDropdown = () => {
+    if (synthOpen) { setSynthOpen(false); return; }
+    setSynthOpen(true);
+    if (synthListRef.current) return;
+    setSynthLoading(true);
+    (window.SonicAPI && window.SonicAPI.listPlugins ? window.SonicAPI.listPlugins() : Promise.resolve({ soundfonts: [] }))
+      .then(async (data) => {
+        const sfonts = (data && data.soundfonts) || [];
+        if (!sfonts.length) { setSynthList([]); setSynthLoading(false); return; }
+        const results = await Promise.all(sfonts.map(sf => {
+          const baseId = String(sf.id || '').replace('sf_', '');
+          return (window.SonicAPI.listSoundfontInstruments ? window.SonicAPI.listSoundfontInstruments(baseId) : Promise.resolve({ presets: [] }))
+            .then(r => ({ sf, presets: (r && r.presets) || [] }))
+            .catch(() => ({ sf, presets: [] }));
+        }));
+        setSynthList(results);
+        setSynthLoading(false);
+      })
+      .catch(() => { setSynthList([]); setSynthLoading(false); });
+  };
+
+  const selectSynthInst = (inst) => {
+    setSynthInst(inst);
+    setSynthOpen(false);
+    localStorage.setItem('studio_media_explorer_synth', JSON.stringify(inst));
+  };
+
+  const playMidiPreview = async (f, token) => {
+    // Play real MIDI file through selected synth instrument (SonicSF)
+    if (!f || !window.SonicSF) return;
+    try {
+      const buf = await readLocalFileBuffer(f);
+      if (!buf) return;
+      if (selectTokenRef.current !== (token || selectTokenRef.current)) return;
+      const midiResult = (typeof parseMidiFile === 'function' ? parseMidiFile : window.parseMidiFile)(buf);
+      if (!midiResult || !midiResult.length) return;
+      const ctx = getAudioContext();
+      const bpmVal = parseInt(synthInst && synthInst.bpm) || 120;
+      const secondsPerBeat = 60.0 / bpmVal;
+      const startWallTime = ctx.currentTime + 0.05;
+      const program = synthInst ? synthInst.program : undefined;
+      const sfId = synthInst ? synthInst.sfId : undefined;
+      const bank = synthInst ? synthInst.bank : 0;
+      if (synthInst && window.SonicSF.selectInstrument) {
+        try { await window.SonicSF.selectInstrument(0, bank, program, sfId); } catch (e2) {}
+      }
+      const prog = (synthInst && synthInst.program !== undefined) ? synthInst.program : undefined;
+      const eng = synthInst ? { soundfont_id: sfId, soundfont_bank: bank, soundfont_program: prog !== undefined ? prog : 0 } : undefined;
+      midiResult.forEach(track => {
+        (track.notes || []).forEach(note => {
+          const startSec = (note.start_beat || 0) * secondsPerBeat;
+          const durMs = Math.max(80, (note.duration_beats || 1) * secondsPerBeat * 1000);
+          window.SonicSF.playNote(note.pitch || 60, (note.velocity || 0.8), durMs, startWallTime + startSec, prog, null, 0, eng);
+        });
+      });
+      // Keep a fake clock so canvas playhead animates; loop uses playStateRef
+      playStateRef.current = { source: null, ctx, startedAt: startWallTime, fakeStart: startWallTime, midiTotal: midiResult[0].duration || 4 };
+      setMidiNotes(midiResult[0].notes || []);
+      setMidiTotal(midiResult[0].duration || 4);
+      setIsPlaying(true);
+      setIsPaused(false);
+      startCanvasClock();
+    } catch (e) { console.error('MIDI preview failed', e); }
+  };
+
   const stopMediaPlayback = React.useCallback(() => {
     if (playStateRef.current) {
       try { if (playStateRef.current.source) playStateRef.current.source.stop(); } catch (e) {}
@@ -9284,6 +9369,11 @@ const MediaExplorerPanel = ({ height }) => {
     if (!f) return;
     stopMediaPlayback();
     if (isMidiFile(f)) {
+      if (f.handle || f.path || f.file_id || f.fileId) {
+        // Real MIDI file: play through selected synth instrument
+        await playMidiPreview(f, token);
+        return;
+      }
       playStateRef.current = { source: null, ctx: null, fakeStart: performance.now() / 1000 };
       setIsPlaying(true);
       setIsPaused(false);
@@ -9365,17 +9455,30 @@ const MediaExplorerPanel = ({ height }) => {
       ctx.strokeStyle = '#333';
       for (let y = 0; y < h - 14; y += 10) { ctx.beginPath(); ctx.moveTo(0, y); ctx.lineTo(w, y); ctx.stroke(); }
       ctx.strokeStyle = '#444';
-      const beats = (f.lengthQn || 16);
+      const totalBeats = midiNotes && midiNotes.length ? Math.max(midiTotal * (f.bpm || 120) / 60, 4) : (f.lengthQn || 16);
+      const beats = totalBeats;
       for (let b = 0; b <= beats; b += 4) {
         const x = (b / beats) * w;
         ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, h - 14); ctx.stroke();
       }
       ctx.fillStyle = '#9ca3af';
-      const events = f.events || 76;
-      for (let i = 0; i < events; i++) {
-        const nx = ((i * 17 + 76) % 95) / 100 * (w - 20);
-        const ny = ((i * 13 + 76) % (h - 30)) + 4;
-        ctx.fillRect(nx, ny, Math.max(8, (i % 5 + 1) * 10), 3);
+      if (midiNotes && midiNotes.length) {
+        // Real piano-roll: rows = pitches (48..84), columns = beats
+        const pitchMin = 48, pitchMax = 84;
+        const pitchRange = Math.max(1, pitchMax - pitchMin);
+        midiNotes.forEach(n => {
+          const x = (n.start_beat / beats) * w;
+          const nw = Math.max(3, (n.duration_beats / beats) * w);
+          const y = h - 14 - 8 - (((Math.min(pitchMax, Math.max(pitchMin, n.pitch)) - pitchMin) / pitchRange) * (h - 30));
+          ctx.fillRect(x, y, nw, 5);
+        });
+      } else {
+        const events = f.events || 76;
+        for (let i = 0; i < events; i++) {
+          const nx = ((i * 17 + 76) % 95) / 100 * (w - 20);
+          const ny = ((i * 13 + 76) % (h - 30)) + 4;
+          ctx.fillRect(nx, ny, Math.max(8, (i % 5 + 1) * 10), 3);
+        }
       }
     } else {
       const pk = peaks && peaks.length > 0 ? peaks : null;
@@ -9408,7 +9511,7 @@ const MediaExplorerPanel = ({ height }) => {
     }
   };
 
-  React.useEffect(() => { drawCanvas(currentTime); }, [peaks, audioBuffer, selected, folder, isPlaying]);
+  React.useEffect(() => { drawCanvas(currentTime); }, [peaks, audioBuffer, midiNotes, selected, folder, isPlaying]);
   React.useEffect(() => () => { if (rafRef.current) cancelAnimationFrame(rafRef.current); }, []);
 
   const handleSelect = (f) => {
@@ -9419,6 +9522,7 @@ const MediaExplorerPanel = ({ height }) => {
     setCurrentTime(0);
     setPeaks(null);
     setAudioBuffer(null);
+    setMidiNotes(null);
     stopMediaPlayback();
     if (f.kind === 'other') return;
     if (autoPlay) { playSelected(f, token); }
@@ -9583,6 +9687,41 @@ const MediaExplorerPanel = ({ height }) => {
             <button id="btnAutoPlay" className={`h-6 px-2 border rounded-sm font-bold text-[10px] flex items-center gap-1 ${autoPlay ? 'bg-gradient-to-r from-cyan-600 to-emerald-600 text-white border-slate-700' : 'bg-[#e0e0e0] text-slate-600 border-[#707070]'}`} onClick={() => setAutoPlay(p => !p)}>
               <i className="fa-solid fa-bolt text-[9px]"></i> <span>Auto-Play</span>
             </button>
+            <div className="relative">
+              <button id="btnSynth" className={`h-6 px-2 border rounded-sm font-bold text-[10px] flex items-center gap-1 ${synthInst ? 'bg-gradient-to-r from-violet-600 to-fuchsia-600 text-white border-slate-700' : 'bg-[#e0e0e0] text-slate-600 border-[#707070]'}`} title="Chọn instrument để preview MIDI" onClick={toggleSynthDropdown}>
+                <i className="fa-solid fa-music text-[9px]"></i> <span>Synth{synthInst ? ': ' + (synthInst.name || '?') : ''}</span>
+                <i className="fa-solid fa-caret-down text-[8px]"></i>
+              </button>
+              {synthOpen && (
+                <div className="absolute bottom-8 left-0 z-40 w-64 bg-white border border-[#808080] shadow-xl rounded-sm text-xs text-slate-800 font-sans max-h-72 overflow-y-auto">
+                  <div className="sticky top-0 bg-[#e0e0e0] px-2 py-1 font-bold border-b border-[#a0a0a0] flex items-center justify-between">
+                    <span>Select Instrument</span>
+                    <button onClick={() => setSynthOpen(false)} className="text-slate-500 hover:text-slate-900"><i className="fa-solid fa-xmark"></i></button>
+                  </div>
+                  {synthLoading && <div className="px-2 py-2 text-slate-400 italic">Loading...</div>}
+                  {!synthLoading && (!synthList || synthList.length === 0) && (
+                    <div className="px-2 py-2 text-slate-400 italic">Không có SoundFont nào</div>
+                  )}
+                  <div className={`flex items-center gap-1 px-2 py-1 cursor-pointer hover:bg-blue-100 ${!synthInst ? 'bg-slate-200' : ''}`} onClick={() => selectSynthInst(null)}>
+                    <i className="fa-solid fa-ban text-slate-400"></i> None (mặc định)
+                  </div>
+                  {!synthLoading && synthList && synthList.map(group => (
+                    <div key={group.sf.id || group.sf.name}>
+                      <div className="px-2 py-1 bg-[#f0f0f0] font-semibold text-slate-600 border-t border-[#e0e0e0] truncate">{group.sf.display || group.sf.name || group.sf.id}</div>
+                      {(group.presets || []).slice(0, 200).map((p, pi) => {
+                        const progId = p.id || p.name || ('preset_' + pi);
+                        return (
+                          <div key={progId} className={`flex items-center gap-1 px-2 pl-4 py-0.5 cursor-pointer hover:bg-blue-100 truncate ${synthInst && synthInst.program === p.program && synthInst.sfId === (group.sf.id || group.sf.name) ? 'bg-slate-200' : ''}`}
+                            onClick={() => selectSynthInst({ sfId: group.sf.id, sfName: group.sf.display || group.sf.name || group.sf.id, bank: p.bank || 0, program: p.program, name: p.name || ('Program ' + p.program) })}>
+                            {p.bank === 128 ? <i className="fa-solid fa-drum text-slate-400"></i> : <i className="fa-solid fa-music text-slate-400"></i>} {p.name || ('Program ' + p.program)}
+                          </div>
+                        );
+                      })}
+                    </div>
+                  ))}
+                </div>
+              )}
+            </div>
           </div>
           <div className="flex items-center gap-3 font-mono text-[11px]">
             <div className="flex items-center gap-1">
@@ -16399,6 +16538,7 @@ const App = () => {
     }
     return result.length > 0 ? result : null;
   };
+  window.parseMidiFile = parseMidiFile;
 
   // ── Load File on Track (with server upload) ──
   const loadFileOnTrack = async (trackId, file) => {
diff --git a/app/static/js/app.precompiled.js b/app/static/js/app.precompiled.js
index d22aac8..754e8e4 100644
--- a/app/static/js/app.precompiled.js
+++ b/app/static/js/app.precompiled.js
@@ -232,12 +232,16 @@ for(let i=0;i<lHistory.length-1;i++){lHistory[i]=lHistory[i+1];rHistory[i]=rHist
 if(woLeftMeterRef.current&&woRightMeterRef.current){const lPct=Math.min(100,leftPeak*100);const rPct=Math.min(100,rightPeak*100);woLeftMeterRef.current.style.width=`${lPct}%`;woRightMeterRef.current.style.width=`${rPct}%`;}// Left channel line (cyan)
 if(woChannelRef.current==='stereo'||woChannelRef.current==='left'){woCtx.strokeStyle='#22d3ee';woCtx.lineWidth=1.2;woCtx.beginPath();for(let i=0;i<lHistory.length;i++){const x=i/(lHistory.length-1)*w;const val=lHistory[i]*zoomGain;const y=centerY-val*centerY;if(i===0)woCtx.moveTo(x,y);else woCtx.lineTo(x,y);}woCtx.stroke();if(woModeRef.current==='envelope'){woCtx.beginPath();for(let i=0;i<lHistory.length;i++){const x=i/(lHistory.length-1)*w;const val=lHistory[i]*zoomGain;const y=centerY+val*centerY;if(i===0)woCtx.moveTo(x,y);else woCtx.lineTo(x,y);}woCtx.stroke();}}// Right channel line (teal)
 if(woChannelRef.current==='stereo'||woChannelRef.current==='right'){woCtx.strokeStyle='#0d9488';woCtx.lineWidth=1.2;woCtx.beginPath();for(let i=0;i<rHistory.length;i++){const x=i/(rHistory.length-1)*w;const val=rHistory[i]*zoomGain;const y=centerY-val*centerY;if(i===0)woCtx.moveTo(x,y);else woCtx.lineTo(x,y);}woCtx.stroke();if(woModeRef.current==='envelope'){woCtx.beginPath();for(let i=0;i<rHistory.length;i++){const x=i/(rHistory.length-1)*w;const val=rHistory[i]*zoomGain;const y=centerY+val*centerY;if(i===0)woCtx.moveTo(x,y);else woCtx.lineTo(x,y);}woCtx.stroke();}}}}renderFrame();return()=>{window.removeEventListener('resize',resizeAll);if(animFrameRef.current)cancelAnimationFrame(animFrameRef.current);};},[isOpen]);React.useEffect(()=>{if(!isOpen){stopAudioDemo();knobsInitializedRef.current=false;}else{setTimeout(()=>{try{window.lucide.createIcons();}catch(e){}},100);}},[isOpen]);if(!isOpen)return null;const switchModule=name=>setOzState(prev=>({...prev,activeModule:name}));const bandKnob=(param,min,max,val,unit,label,freq,color,filterType)=>/*#__PURE__*/React.createElement("div",{className:"bg-slate-900/80 border border-slate-800 p-2 flex flex-col justify-between items-center rounded-lg"},/*#__PURE__*/React.createElement("div",{className:"flex items-center justify-between text-[10px] font-bold w-full",style:{color}},/*#__PURE__*/React.createElement("span",null,label),/*#__PURE__*/React.createElement("span",{className:"text-[9px] font-mono text-slate-400"},freq)),/*#__PURE__*/React.createElement("div",{className:"my-1"},/*#__PURE__*/React.createElement(MasteringKnob,{param:param,min:min,max:max,value:ozState[param]!==undefined?ozState[param]:val,unit:unit,color:color,onChange:(p,v)=>setOzState(prev=>({...prev,[p]:v}))})),/*#__PURE__*/React.createElement("div",{className:"text-[9px] text-slate-500 font-mono text-center mt-1"},filterType));return/*#__PURE__*/React.createElement("div",{className:"fixed inset-0 z-[100] flex items-center justify-center bg-black/70 backdrop-blur-sm",onClick:onClose},/*#__PURE__*/React.createElement("div",{id:"masteringModalBody",className:"flex flex-col bg-slate-950 text-slate-200 w-[95vw] h-[92vh] max-w-[1400px] rounded-2xl border border-slate-800/80 shadow-2xl overflow-hidden",onClick:e=>e.stopPropagation(),style:{fontFamily:"'Inter', sans-serif"}},/*#__PURE__*/React.createElement("header",{className:"h-12 bg-slate-900/90 border-b border-slate-800/80 flex items-center justify-between px-4 z-30 shrink-0"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-3"},/*#__PURE__*/React.createElement("div",{className:"w-7 h-7 rounded-lg bg-cyan-600 flex items-center justify-center font-bold text-white shadow-lg shadow-cyan-950"},/*#__PURE__*/React.createElement("i",{"data-lucide":"zap",className:"w-3.5 h-3.5"})),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("h1",{className:"text-xs font-bold tracking-wider text-white flex items-center gap-2"},"MASTERING SUITE 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mb-1"},"OUT"),/*#__PURE__*/React.createElement("div",{className:"flex-1 w-6 bg-slate-900 border border-slate-800 rounded relative overflow-hidden flex items-end"},/*#__PURE__*/React.createElement("canvas",{ref:outMeterCanvasRef,className:"w-full h-full block"})))),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-1.5 mt-2"},/*#__PURE__*/React.createElement("button",{onClick:()=>setOzState(prev=>({...prev,isBypassed:!prev.isBypassed})),className:`py-1.5 rounded text-[10px] font-bold border transition-colors ${ozState.isBypassed?'bg-cyan-600 border-cyan-500 text-white':'bg-slate-800 hover:bg-slate-700 text-slate-200 border-slate-700'}`},"Bypass"),/*#__PURE__*/React.createElement("button",{className:"bg-slate-800 hover:bg-slate-700 text-slate-200 py-1.5 rounded text-[10px] font-bold border border-slate-700 transition-colors"},"Gain Match"),/*#__PURE__*/React.createElement("button",{className:"bg-slate-800 hover:bg-slate-700 text-slate-300 py-1.5 rounded text-[10px] border border-slate-700"},"Codec"),/*#__PURE__*/React.createElement("button",{className:"bg-slate-800 hover:bg-slate-700 text-slate-300 py-1.5 rounded text-[10px] border border-slate-700"},"Dither"))))));};// ── Media Explorer Panel (from md/51_MEDIA_EXPLORER.md) ──
-const MEDIA_LIBRARY_SAMPLES=[{name:"MIDI_Loop_01.mid",events:95,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_02_Bass.mid",events:48,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_03_Lead.mid",events:110,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_04.mid",events:76,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_05_Bass.mid",events:52,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_06.mid",events:88,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"}];const MediaExplorerPanel=({height})=>{const[userFiles,setUserFiles]=React.useState([]);const[folder,setFolder]=React.useState('library');const[selected,setSelected]=React.useState(null);const[filterText,setFilterText]=React.useState('');const[viewMode,setViewMode]=React.useState('details');const[isPlaying,setIsPlaying]=React.useState(false);const[isPaused,setIsPaused]=React.useState(false);const[isLooping,setIsLooping]=React.useState(false);const[autoPlay,setAutoPlay]=React.useState(true);const[pitch,setPitch]=React.useState(0.0);const[rate,setRate]=React.useState(1.0);const[volumeDb,setVolumeDb]=React.useState(0.0);const[currentTime,setCurrentTime]=React.useState(0);const[peaks,setPeaks]=React.useState(null);const[audioBuffer,setAudioBuffer]=React.useState(null);const[computerRoots,setComputerRoots]=React.useState(null);const[computerTree,setComputerTree]=React.useState({});const[computerPath,setComputerPath]=React.useState(null);const[computerFiles,setComputerFiles]=React.useState([]);const[computerMode,setComputerMode]=React.useState('server');const[clientRoot,setClientRoot]=React.useState(null);const[treeWidth,setTreeWidth]=React.useState(176);const treeWidthRef=React.useRef(176);treeWidthRef.current=treeWidth;const startTreeResize=e=>{e.preventDefault();const startX=e.clientX;const startW=treeWidthRef.current;const onMove=ev=>{setTreeWidth(Math.max(110,Math.min(420,startW+(ev.clientX-startX))));};const onUp=()=>{document.removeEventListener('mousemove',onMove);document.removeEventListener('mouseup',onUp);};document.addEventListener('mousemove',onMove);document.addEventListener('mouseup',onUp);};const canvasRef=React.useRef(null);const playStateRef=React.useRef(null);const rafRef=React.useRef(null);const selectTokenRef=React.useRef(0);React.useEffect(()=>{if(window.SonicAPI&&window.SonicAPI.listMyFiles){window.SonicAPI.listMyFiles([]).then(data=>setUserFiles(data||[])).catch(()=>{});}return()=>{stopMediaPlayback();};// eslint-disable-next-line react-hooks/exhaustive-deps
-},[]);const isMidiFile=f=>f&&(f.kind==='midi'||/\.(mid|midi)$/i.test(f.name||f.original_name||''));const fileDuration=f=>{if(!f)return 0;if(isMidiFile(f))return(f.lengthQn||16)*60/(f.bpm||120);const matches=selected&&(f.path&&f.path===selected.path||!f.path&&(f.file_id||f.fileId)===(selected.file_id||selected.fileId));return f.duration||(audioBuffer&&matches?audioBuffer.duration:0)||0;};const folderFiles=React.useMemo(()=>{if(folder==='library')return MEDIA_LIBRARY_SAMPLES;if(folder==='computer'){const node=computerTree[computerPath]||{dirs:[]};return[...(node.dirs||[]),...computerFiles];}return userFiles.filter(f=>folder==='uploads'?(f.type||'Upload')==='Upload':(f.type||'Processed')==='Processed');},[folder,userFiles,computerFiles,computerTree,computerPath]);const visibleFiles=React.useMemo(()=>{const q=filterText.toLowerCase().trim();if(!q)return folderFiles;return folderFiles.filter(f=>(f.name||f.original_name||'').toLowerCase().includes(q));},[folderFiles,filterText]);const loadWaveform=async f=>{const token=selectTokenRef.current;if(f&&(f.handle||f.path)){try{const buf=await readLocalFileBuffer(f);if(selectTokenRef.current!==token)return;if(!buf){setPeaks(null);return;}const ctx=getAudioContext();const decoded=await ctx.decodeAudioData(buf);if(selectTokenRef.current!==token)return;setAudioBuffer(decoded);const data=decoded.getChannelData(0);const count=600;const step=Math.max(1,Math.floor(data.length/count));const pk=[];for(let i=0;i<data.length;i+=step){let m=0;for(let j=i;j<Math.min(i+step,data.length);j++){const v=Math.abs(data[j]);if(v>m)m=v;}pk.push(m);}setPeaks(pk);}catch(e){if(selectTokenRef.current===token)setPeaks(null);}return;}const fid=f.file_id||f.fileId;if(!fid){setPeaks(null);return;}try{const resp=await fetch(`${API_BASE_URL}/api/v1/audio/waveform/${fid}?num_peaks=600`);const data=await resp.json();if(selectTokenRef.current!==token)return;setPeaks(data.peaks||[]);}catch(e){setPeaks(null);}};const openMyComputer=async()=>{setFolder('computer');if(window.showDirectoryPicker){try{const handle=await window.showDirectoryPicker({mode:'read'});setComputerMode('client');setClientRoot(handle);const rootEntry={name:handle.name,path:'root',is_dir:true,handle};setComputerRoots([rootEntry]);setComputerPath('root');setComputerFiles([]);setComputerTree({root:{handle,parent:null,dirs:[],expanded:true}});await browseComputerDir(rootEntry);return;}catch(e){if(e&&e.name==='AbortError')return;window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');return;}}// Fallback: server API (trình duyệt không hỗ trợ File System Access API)
+const MEDIA_LIBRARY_SAMPLES=[{name:"MIDI_Loop_01.mid",events:95,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_02_Bass.mid",events:48,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_03_Lead.mid",events:110,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_04.mid",events:76,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_05_Bass.mid",events:52,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_06.mid",events:88,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"}];const MediaExplorerPanel=({height})=>{const[userFiles,setUserFiles]=React.useState([]);const[folder,setFolder]=React.useState('library');const[selected,setSelected]=React.useState(null);const[filterText,setFilterText]=React.useState('');const[viewMode,setViewMode]=React.useState('details');const[isPlaying,setIsPlaying]=React.useState(false);const[isPaused,setIsPaused]=React.useState(false);const[isLooping,setIsLooping]=React.useState(false);const[autoPlay,setAutoPlay]=React.useState(true);const[pitch,setPitch]=React.useState(0.0);const[rate,setRate]=React.useState(1.0);const[volumeDb,setVolumeDb]=React.useState(0.0);const[currentTime,setCurrentTime]=React.useState(0);const[peaks,setPeaks]=React.useState(null);const[audioBuffer,setAudioBuffer]=React.useState(null);const[midiNotes,setMidiNotes]=React.useState(null);const[midiTotal,setMidiTotal]=React.useState(4);const[computerRoots,setComputerRoots]=React.useState(null);const[computerTree,setComputerTree]=React.useState({});const[computerPath,setComputerPath]=React.useState(null);const[computerFiles,setComputerFiles]=React.useState([]);const[computerMode,setComputerMode]=React.useState('server');const[clientRoot,setClientRoot]=React.useState(null);const[synthInst,setSynthInst]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_synth');return saved?JSON.parse(saved):null;}());const[synthOpen,setSynthOpen]=React.useState(false);const[synthList,setSynthList]=React.useState(null);const[synthLoading,setSynthLoading]=React.useState(false);const synthListRef=React.useRef(null);synthListRef.current=synthList;const[treeWidth,setTreeWidth]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_tree_width');return saved?parseInt(saved):176;}());const treeWidthRef=React.useRef(176);treeWidthRef.current=treeWidth;const startTreeResize=e=>{e.preventDefault();const startX=e.clientX;const startW=treeWidthRef.current;const onMove=ev=>{const newW=Math.max(110,Math.min(420,startW+(ev.clientX-startX)));treeWidthRef.current=newW;setTreeWidth(newW);};const onUp=()=>{document.removeEventListener('mousemove',onMove);document.removeEventListener('mouseup',onUp);localStorage.setItem('studio_media_explorer_tree_width',treeWidthRef.current.toString());};document.addEventListener('mousemove',onMove);document.addEventListener('mouseup',onUp);};const canvasRef=React.useRef(null);const playStateRef=React.useRef(null);const rafRef=React.useRef(null);const selectTokenRef=React.useRef(0);React.useEffect(()=>{if(window.SonicAPI&&window.SonicAPI.listMyFiles){window.SonicAPI.listMyFiles([]).then(data=>setUserFiles(data||[])).catch(()=>{});}return()=>{stopMediaPlayback();};// eslint-disable-next-line react-hooks/exhaustive-deps
+},[]);const isMidiFile=f=>f&&(f.kind==='midi'||/\.(mid|midi)$/i.test(f.name||f.original_name||''));const fileDuration=f=>{if(!f)return 0;if(isMidiFile(f)){if(midiTotal&&midiNotes&&midiNotes.length)return midiTotal;return(f.lengthQn||16)*60/(f.bpm||120);}const matches=selected&&(f.path&&f.path===selected.path||!f.path&&(f.file_id||f.fileId)===(selected.file_id||selected.fileId));return f.duration||(audioBuffer&&matches?audioBuffer.duration:0)||0;};const folderFiles=React.useMemo(()=>{if(folder==='library')return MEDIA_LIBRARY_SAMPLES;if(folder==='computer'){const node=computerTree[computerPath]||{dirs:[]};return[...(node.dirs||[]),...computerFiles];}return userFiles.filter(f=>folder==='uploads'?(f.type||'Upload')==='Upload':(f.type||'Processed')==='Processed');},[folder,userFiles,computerFiles,computerTree,computerPath]);const visibleFiles=React.useMemo(()=>{const q=filterText.toLowerCase().trim();if(!q)return folderFiles;return folderFiles.filter(f=>(f.name||f.original_name||'').toLowerCase().includes(q));},[folderFiles,filterText]);const loadWaveform=async f=>{const token=selectTokenRef.current;if(f&&(f.handle||f.path)){try{const buf=await readLocalFileBuffer(f);if(selectTokenRef.current!==token)return;if(!buf){setPeaks(null);return;}const ctx=getAudioContext();const decoded=await ctx.decodeAudioData(buf);if(selectTokenRef.current!==token)return;setAudioBuffer(decoded);const data=decoded.getChannelData(0);const count=600;const step=Math.max(1,Math.floor(data.length/count));const pk=[];for(let i=0;i<data.length;i+=step){let m=0;for(let j=i;j<Math.min(i+step,data.length);j++){const v=Math.abs(data[j]);if(v>m)m=v;}pk.push(m);}setPeaks(pk);}catch(e){if(selectTokenRef.current===token)setPeaks(null);}return;}const fid=f.file_id||f.fileId;if(!fid){setPeaks(null);return;}try{const resp=await fetch(`${API_BASE_URL}/api/v1/audio/waveform/${fid}?num_peaks=600`);const data=await resp.json();if(selectTokenRef.current!==token)return;setPeaks(data.peaks||[]);}catch(e){setPeaks(null);}};const openMyComputer=async()=>{setFolder('computer');if(window.showDirectoryPicker){try{const handle=await window.showDirectoryPicker({mode:'read'});setComputerMode('client');setClientRoot(handle);const rootEntry={name:handle.name,path:'root',is_dir:true,handle};setComputerRoots([rootEntry]);setComputerPath('root');setComputerFiles([]);setComputerTree({root:{handle,parent:null,dirs:[],expanded:true}});await browseComputerDir(rootEntry);return;}catch(e){if(e&&e.name==='AbortError')return;window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');return;}}// Fallback: server API (trình duyệt không hỗ trợ File System Access API)
 setComputerMode('server');if(computerRoots)return;setComputerRoots(null);try{const resp=await fetch(`${API_BASE_URL}/api/v1/media/computer`);if(!resp.ok)throw new Error('HTTP '+resp.status);const data=await resp.json();const roots=data.roots||[];setComputerRoots(roots.length?roots:[{path:'/',name:'Root (/)',is_dir:true}]);if(!roots.length)window.showToast&&window.showToast('Không tìm thấy ổ đĩa nào','warning');}catch(e){setComputerRoots([{path:'/',name:'Root (/)',is_dir:true}]);window.showToast&&window.showToast('Không thể truy cập My Computer: '+e.message,'error');}};const browseClientDir=async entry=>{const handle=entry&&entry.handle;if(!handle||!handle.entries)return;const dirs=[];const files=[];const parentPath=entry.path;try{for await(const[name,h]of handle.entries()){if(name.startsWith('.'))continue;if(h.kind==='directory'){dirs.push({name,path:parentPath+'/'+name,is_dir:true,handle:h});}else{const ext=(name.split('.').pop()||'').toLowerCase();const kind=ext==='mid'||ext==='midi'?'midi':['wav','mp3','ogg','flac','aiff','aif','m4a','aac','opus'].includes(ext)?'audio':'other';let size=0;try{const f=await h.getFile();size=f.size;}catch(e2){}files.push({name,path:parentPath+'/'+name,is_dir:false,size_mb:size?+(size/1048576).toFixed(2):0,ext:'.'+ext,kind,handle:h});}}dirs.sort((a,b)=>a.name.localeCompare(b.name));files.sort((a,b)=>a.name.localeCompare(b.name));setComputerPath(parentPath);setComputerFiles(files);setSelected(null);setCurrentTime(0);stopMediaPlayback();setComputerTree(prev=>({...prev,[parentPath]:{handle,parent:entry.parent||null,dirs,expanded:true}}));}catch(e){window.showToast&&window.showToast('Không thể đọc thư mục: '+e.message,'error');}};const browseComputerDir=async entry=>{if(!entry)return;if(computerMode==='client'||entry.handle){if(entry.handle&&entry.handle.entries){const parentInfo=computerTree[entry.path];await browseClientDir({...entry,parent:parentInfo?parentInfo.parent:null});return;}}const path=entry.path||entry;if(!path)return;try{const resp=await fetch(`${API_BASE_URL}/api/v1/media/browse?path=${encodeURIComponent(path)}`);if(!resp.ok)throw new Error('HTTP '+resp.status);const data=await resp.json();setComputerPath(data.path);setComputerFiles(data.files||[]);setSelected(null);setCurrentTime(0);stopMediaPlayback();setComputerTree(prev=>({...prev,[path]:{dirs:data.dirs||[],expanded:true}}));}catch(e){window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');}};const toggleComputerDir=async entry=>{if(!entry)return;const path=entry.path||entry;const node=computerTree[path];if(node&&node.expanded){setComputerTree(prev=>({...prev,[path]:{...prev[path],expanded:false}}));}else{await browseComputerDir(entry);}};const goComputerParent=()=>{if(!computerPath)return;if(computerMode==='client'||clientRoot){const node=computerTree[computerPath];const parentHandle=node&&node.parent;if(parentHandle){const parentEntry=computerRoots&&computerRoots[0]&&parentHandle===clientRoot?computerRoots[0]:{name:parentHandle.name,path:computerPath.split('/').slice(0,-1).join('/')||'root',is_dir:true,handle:parentHandle};browseComputerDir({...parentEntry,parent:parentHandle===clientRoot?null:computerTree[parentEntry.path]?computerTree[parentEntry.path].parent:null});}return;}const isUnix=computerPath.startsWith('/');const parts=computerPath.split(/[\\/]/).filter(Boolean);parts.pop();if(isUnix){browseComputerDir(parts.length?'/'+parts.join('/'):'/');}else{// Windows: quay về root ổ đĩa nếu đã lên tới đỉnh
-browseComputerDir(parts.length?parts.join('\\'):computerPath.split(/[\\/]/)[0]+'\\');}};const readLocalFileBuffer=async f=>{if(f&&f.handle&&typeof f.handle.getFile==='function'){const file=await f.handle.getFile();return await file.arrayBuffer();}const url=filePreviewUrl(f);if(!url)return null;const resp=await fetch(url);return await resp.arrayBuffer();};const filePreviewUrl=f=>{if(f&&f.path&&!(f.handle&&f.handle.getFile))return`${API_BASE_URL}/api/v1/media/file?path=${encodeURIComponent(f.path)}`;const fid=f&&(f.file_id||f.fileId);return fid?`${API_BASE_URL}/api/v1/audio/download/${fid}`:null;};const stopMediaPlayback=React.useCallback(()=>{if(playStateRef.current){try{if(playStateRef.current.source)playStateRef.current.source.stop();}catch(e){}try{if(playStateRef.current.source)playStateRef.current.source.disconnect();}catch(e){}playStateRef.current=null;}if(rafRef.current)cancelAnimationFrame(rafRef.current);rafRef.current=null;setIsPlaying(false);setIsPaused(false);},[]);const playSelected=async(f,token)=>{if(!f)return;stopMediaPlayback();if(isMidiFile(f)){playStateRef.current={source:null,ctx:null,fakeStart:performance.now()/1000};setIsPlaying(true);setIsPaused(false);startCanvasClock();return;}const fid=f.file_id||f.fileId;const buf=await readLocalFileBuffer(f);if(selectTokenRef.current!==(token||selectTokenRef.current))return;if(!buf)return;try{const ctx=getAudioContext();const decoded=await ctx.decodeAudioData(buf);if(selectTokenRef.current!==(token||selectTokenRef.current))return;setAudioBuffer(decoded);const src=ctx.createBufferSource();src.buffer=decoded;src.loop=isLooping;src.playbackRate.value=rate;const gain=ctx.createGain();const linear=volumeDb<=-50?0:Math.pow(10,volumeDb/20);gain.gain.value=linear;src.connect(gain);gain.connect(ctx.destination);src.start();const startedAt=ctx.currentTime;playStateRef.current={source:src,ctx,startedAt};setIsPlaying(true);setIsPaused(false);startCanvasClock();}catch(e){console.error('Preview failed',e);}};const togglePause=()=>{const st=playStateRef.current;if(!st)return;if(isPaused){if(st.ctx)st.ctx.resume();setIsPaused(false);}else{if(st.ctx)st.ctx.suspend();setIsPaused(true);}};const startCanvasClock=()=>{if(rafRef.current)cancelAnimationFrame(rafRef.current);const tick=()=>{rafRef.current=requestAnimationFrame(tick);let t=currentTime;const st=playStateRef.current;if(st&&!isPaused){t=st.ctx?st.ctx.currentTime-st.startedAt:performance.now()/1000-st.fakeStart;}setCurrentTime(t);drawCanvas(t);};tick();};const drawCanvas=t=>{const canvas=canvasRef.current;if(!canvas)return;const ctx=canvas.getContext('2d');const w=canvas.clientWidth,h=canvas.clientHeight;if(!w||!h)return;canvas.width=w*2;canvas.height=h*2;ctx.scale(2,2);ctx.clearRect(0,0,w,h);ctx.fillStyle='#181818';ctx.fillRect(0,0,w,h);const f=selected;if(!f){ctx.fillStyle='#555';ctx.font='12px JetBrains Mono, monospace';ctx.fillText('No file selected',10,h/2);return;}const dur=fileDuration(f);if(isMidiFile(f)){ctx.strokeStyle='#333';for(let y=0;y<h-14;y+=10){ctx.beginPath();ctx.moveTo(0,y);ctx.lineTo(w,y);ctx.stroke();}ctx.strokeStyle='#444';const beats=f.lengthQn||16;for(let b=0;b<=beats;b+=4){const x=b/beats*w;ctx.beginPath();ctx.moveTo(x,0);ctx.lineTo(x,h-14);ctx.stroke();}ctx.fillStyle='#9ca3af';const events=f.events||76;for(let i=0;i<events;i++){const nx=(i*17+76)%95/100*(w-20);const ny=(i*13+76)%(h-30)+4;ctx.fillRect(nx,ny,Math.max(8,(i%5+1)*10),3);}}else{const pk=peaks&&peaks.length>0?peaks:null;if(pk){const mid=h/2;ctx.fillStyle='#22c55e';for(let i=0;i<pk.length;i++){const x=i/pk.length*w;const ph=Math.max(2,pk[i]*(h/2-4));ctx.fillRect(x,mid-ph,Math.max(1,w/pk.length),ph*2);}}else{ctx.fillStyle='#666';ctx.font='11px monospace';ctx.fillText('Waveform unavailable',10,h/2);}}// ruler
+browseComputerDir(parts.length?parts.join('\\'):computerPath.split(/[\\/]/)[0]+'\\');}};const readLocalFileBuffer=async f=>{if(f&&f.handle&&typeof f.handle.getFile==='function'){const file=await f.handle.getFile();return await file.arrayBuffer();}const url=filePreviewUrl(f);if(!url)return null;const resp=await fetch(url);return await resp.arrayBuffer();};const filePreviewUrl=f=>{if(f&&f.path&&!(f.handle&&f.handle.getFile))return`${API_BASE_URL}/api/v1/media/file?path=${encodeURIComponent(f.path)}`;const fid=f&&(f.file_id||f.fileId);return fid?`${API_BASE_URL}/api/v1/audio/download/${fid}`:null;};const toggleSynthDropdown=()=>{if(synthOpen){setSynthOpen(false);return;}setSynthOpen(true);if(synthListRef.current)return;setSynthLoading(true);(window.SonicAPI&&window.SonicAPI.listPlugins?window.SonicAPI.listPlugins():Promise.resolve({soundfonts:[]})).then(async data=>{const sfonts=data&&data.soundfonts||[];if(!sfonts.length){setSynthList([]);setSynthLoading(false);return;}const results=await Promise.all(sfonts.map(sf=>{const baseId=String(sf.id||'').replace('sf_','');return(window.SonicAPI.listSoundfontInstruments?window.SonicAPI.listSoundfontInstruments(baseId):Promise.resolve({presets:[]})).then(r=>({sf,presets:r&&r.presets||[]})).catch(()=>({sf,presets:[]}));}));setSynthList(results);setSynthLoading(false);}).catch(()=>{setSynthList([]);setSynthLoading(false);});};const selectSynthInst=inst=>{setSynthInst(inst);setSynthOpen(false);localStorage.setItem('studio_media_explorer_synth',JSON.stringify(inst));};const playMidiPreview=async(f,token)=>{// Play real MIDI file through selected synth instrument (SonicSF)
+if(!f||!window.SonicSF)return;try{const buf=await readLocalFileBuffer(f);if(!buf)return;if(selectTokenRef.current!==(token||selectTokenRef.current))return;const midiResult=(typeof parseMidiFile==='function'?parseMidiFile:window.parseMidiFile)(buf);if(!midiResult||!midiResult.length)return;const ctx=getAudioContext();const bpmVal=parseInt(synthInst&&synthInst.bpm)||120;const secondsPerBeat=60.0/bpmVal;const startWallTime=ctx.currentTime+0.05;const program=synthInst?synthInst.program:undefined;const sfId=synthInst?synthInst.sfId:undefined;const bank=synthInst?synthInst.bank:0;if(synthInst&&window.SonicSF.selectInstrument){try{await window.SonicSF.selectInstrument(0,bank,program,sfId);}catch(e2){}}const prog=synthInst&&synthInst.program!==undefined?synthInst.program:undefined;const eng=synthInst?{soundfont_id:sfId,soundfont_bank:bank,soundfont_program:prog!==undefined?prog:0}:undefined;midiResult.forEach(track=>{(track.notes||[]).forEach(note=>{const startSec=(note.start_beat||0)*secondsPerBeat;const durMs=Math.max(80,(note.duration_beats||1)*secondsPerBeat*1000);window.SonicSF.playNote(note.pitch||60,note.velocity||0.8,durMs,startWallTime+startSec,prog,null,0,eng);});});// Keep a fake clock so canvas playhead animates; loop uses playStateRef
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${synthInst&&synthInst.program===p.program&&synthInst.sfId===(group.sf.id||group.sf.name)?'bg-slate-200':''}`,onClick:()=>selectSynthInst({sfId:group.sf.id,sfName:group.sf.display||group.sf.name||group.sf.id,bank:p.bank||0,program:p.program,name:p.name||'Program '+p.program})},p.bank===128?/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-drum text-slate-400"}):/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-music text-slate-400"})," ",p.name||'Program '+p.program);})))))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-3 font-mono text-[11px]"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1"},/*#__PURE__*/React.createElement("span",null,"Pitch:"),/*#__PURE__*/React.createElement("button",{className:"px-1 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[10px]",onClick:()=>togglePitch(-0.5)},"-"),/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1 h-5 flex items-center w-14"},/*#__PURE__*/React.createElement("input",{type:"number",value:pitch.toFixed(1),step:"0.5",onChange:e=>setPitch(parseFloat(e.target.value)||0),className:"w-full text-xs text-right outline-none bg-transparent"})),/*#__PURE__*/React.createElement("button",{className:"px-1 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[10px]",onClick:()=>togglePitch(0.5)},"+")),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1"},/*#__PURE__*/React.createElement("span",null,"Rate:"),/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1 h-5 flex items-center w-12"},/*#__PURE__*/React.createElement("input",{type:"number",value:rate.toFixed(2),step:"0.1",onChange:e=>setRate(Math.max(0.25,Math.min(4,parseFloat(e.target.value)||1))),className:"w-full text-xs text-right outline-none bg-transparent"})),/*#__PURE__*/React.createElement("button",{className:"w-5 h-5 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[9px]",onClick:()=>toggleRate(-1)},"-"),/*#__PURE__*/React.createElement("button",{className:"w-5 h-5 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[9px]",onClick:()=>toggleRate(1)},"+"))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-2"},/*#__PURE__*/React.createElement("span",{className:"font-sans text-slate-700"},"Volume:"),/*#__PURE__*/React.createElement("input",{type:"range",min:"-60",max:"12",step:"0.5",value:volumeDb,onChange:e=>setVolumeDb(parseFloat(e.target.value)),className:"me-fader-slider w-24"}),/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1 h-5 flex items-center justify-center w-14 font-mono text-[11px]"},volumeDb<=-50?'-inf':volumeDb.toFixed(1)," dB")),/*#__PURE__*/React.createElement("div",{className:`px-2 py-0.5 border font-mono font-bold text-[10px] rounded-sm ${selIsMidi?'bg-purple-950 text-purple-300 border-purple-800':'bg-emerald-950 text-emerald-300 border-emerald-800'}`},selIsMidi?'MIDI':'Audio')),/*#__PURE__*/React.createElement("div",{className:"flex items-stretch gap-2 my-1 flex-1 min-h-0"},/*#__PURE__*/React.createElement("div",{className:"flex-1 bg-[#181818] border border-[#3a3a3a] relative overflow-hidden"},/*#__PURE__*/React.createElement("canvas",{ref:canvasRef,className:"w-full h-full block cursor-pointer"})),/*#__PURE__*/React.createElement("div",{className:"w-48 bg-[#181818] border border-[#3a3a3a] p-1.5 font-mono text-[10px] text-slate-300 leading-tight overflow-y-auto shrink-0"},selected?selIsMidi&&!selected.path?/*#__PURE__*/React.createElement(React.Fragment,null,/*#__PURE__*/React.createElement("div",null,selected.events," MIDI events"),/*#__PURE__*/React.createElement("div",null,"Length: ",selected.lengthQn," quarter notes"),/*#__PURE__*/React.createElement("div",null,"Length: ",selected.time," (est)"),/*#__PURE__*/React.createElement("div",null,"Ticks per quarter note: ",selected.tpqn)):/*#__PURE__*/React.createElement(React.Fragment,null,/*#__PURE__*/React.createElement("div",null,"Size: ",selected.size_mb!=null?selected.size_mb.toFixed(2)+' MB':'-'),/*#__PURE__*/React.createElement("div",null,"Duration: ",selDur.toFixed(2),"s"),/*#__PURE__*/React.createElement("div",null,"Sample Rate: 44100 Hz"),/*#__PURE__*/React.createElement("div",null,"Type: ",selected.path?selIsMidi?'Local MIDI':selected.kind==='other'?'Local File':'Local Audio':selected.type||'Audio')):/*#__PURE__*/React.createElement("div",null,"No file selected"))),/*#__PURE__*/React.createElement("div",{className:"h-5 bg-[#c0c0c0] border-t border-white flex items-center justify-between text-[11px] font-mono px-1 shrink-0"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-3"},/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1.5 text-slate-900 font-bold"},formatTime(currentTime)," / ",formatTime(selDur))),/*#__PURE__*/React.createElement("div",{className:"text-slate-800 font-bold truncate max-w-[40%]"},selected?selected.name||selected.original_name:'No file selected'),/*#__PURE__*/React.createElement("div",{className:"text-slate-700"},selBpm," bpm x",rate.toFixed(2)))));};const App=()=>{// ── State Definitions ──
 const[tracks,setTracks]=useState([{id:'1',name:'Track 01',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#0f766e',markers:[],serverFileId:null,clips:[],sections:[],midiItems:[],isArmed:false,monitoringEnabled:true,inputSource:{deviceType:'NONE',deviceId:''}},{id:'2',name:'Track 02',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#1d4ed8',markers:[],serverFileId:null,clips:[],sections:[],midiItems:[],isArmed:false,monitoringEnabled:true,inputSource:{deviceType:'NONE',deviceId:''}}]);const[appWarningModal,setAppWarningModal]=useState(null);const[bpm,setBpm]=useState(localStorage.getItem('studio_bpm')||'120');const prevBpmRef=useRef(bpm);const[draggedClip,setDraggedClip]=useState(null);const[hoveredTrackId,setHoveredTrackId]=useState(null);// Recalculate item/section/selection durations when BPM changes
 useEffect(()=>{const oldSpb=prevBpmRef.current?60.0/parseFloat(prevBpmRef.current)*4:null;const bpmVal=parseFloat(bpm)||120;const secondsPerBar=60.0/bpmVal*4;// Recalculate range loop selection to maintain bar count (tempo mode only)
 if(oldSpb&&selectionFollowsTempo&&selectionStart!==null&&selectionEnd!==null&&selectionEnd>selectionStart){const startBar=selectionStart/oldSpb;const endBar=selectionEnd/oldSpb;if(endBar-startBar>0.01){setSelectionStart(startBar*secondsPerBar);setSelectionEnd(endBar*secondsPerBar);}}prevBpmRef.current=bpm;// Force canvas redraw
@@ -428,7 +432,7 @@ const handleHandleDragStart=(e,side)=>{e.preventDefault();e.stopPropagation();co
 const toggleTrackSoloEvaluate=trackId=>{const wasPlaying=isPlaying;const playingSubTab=subTabs.find(s=>s.isPlaying&&s.type==='PIANO_ROLL');stopAllPlayback();setTracks(prev=>prev.map(t=>t.id===trackId?{...t,solo:!t.solo,muted:false}:t));setTimeout(()=>{const soloCtx=getAudioContext();if(wasPlaying){startOffsetTimeRef.current=currentTime;startAudioTimeRef.current=soloCtx.currentTime;startBufferOffsetRef.current=currentTime;setIsPlaying(true);startTrackPlayback(currentTime);}if(playingSubTab){const prSt=subTabs.find(s=>s.id===playingSubTab.id);if(prSt){const prOffset=prSt.currentTime||0;startOffsetTimeRef.current=prOffset;startAudioTimeRef.current=soloCtx.currentTime;startBufferOffsetRef.current=prOffset*(prSt.speed||1.0);schedulePianoRollMidi(prSt,prOffset);startSubTabPlayback(prSt,prOffset);setSubTabs(prev=>prev.map(s=>s.id===prSt.id?Object.assign({},s,{isPlaying:true,currentTime:prOffset}):s));}}},60);setTimeout(()=>lucide.createIcons(),50);};const toggleTrackMute=trackId=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,muted:!t.muted}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'MUTE',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});setTimeout(()=>lucide.createIcons(),50);};const updateTrackProp=(trackId,props)=>{setTracks(prev=>prev.map(t=>t.id===trackId?{...t,...props}:t));setTimeout(()=>lucide.createIcons(),50);};const toggleTrackDrum=trackId=>{var mt=tracks||[];var tidx=mt.findIndex(function(tr){return tr.id===trackId;});if(tidx<0)tidx=0;setTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;const becomingPercussion=!t.is_percussion;let newBank=becomingPercussion?128:t._saved_sf_bank!==undefined?t._saved_sf_bank:0;let newProgram=becomingPercussion?0:t._saved_sf_program!==undefined?t._saved_sf_program:0;let newCh=becomingPercussion?9:t._saved_sf_channel!==undefined?t._saved_sf_channel:tidx%16;return{...t,is_percussion:becomingPercussion,soundfont_bank:newBank,instrumentProgram:newProgram,midiChannel:newCh,_saved_sf_bank:becomingPercussion?t.soundfont_bank:t._saved_sf_bank,_saved_sf_program:becomingPercussion?t.instrumentProgram:t._saved_sf_program,_saved_sf_channel:becomingPercussion?t.midiChannel:t._saved_sf_channel,synth_engine:t.synth_engine?{...t.synth_engine,soundfont_bank:newBank,soundfont_program:newProgram}:t.synth_engine};}));setTimeout(()=>lucide.createIcons(),50);};const updateTrackVolumeDb=(trackId,val)=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,volumeDb:val}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'VOLUME_CHANGE',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});// Real-time update during playback
 const nodes=activeTrackNodesRef.current[trackId];if(nodes){const volLinear=val<=-50?0:Math.pow(10,val/20);nodes.gainNode.gain.setValueAtTime(volLinear,getAudioContext().currentTime);}};const updateTrackPan=(trackId,val)=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,pan:val}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'PAN_CHANGE',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});// Real-time update during playback
 const nodes=activeTrackNodesRef.current[trackId];if(nodes){nodes.pannerNode.pan.setValueAtTime(val/100,getAudioContext().currentTime);}};const updateTrackName=(trackId,name)=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,name}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'RENAME',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});};const updateTrackColor=(trackId,color)=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,color}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'RECOLOR',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});};const updateClipName=(trackId,clipId,newName)=>{setTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;const clips=t.clips&&t.clips.length>0?t.clips:[];return{...t,clips:clips.map(c=>c.id===clipId?{...c,name:newName}:c)};}));};// ── MIDI .mid file parser ──
-const parseMidiFile=arrayBuffer=>{const data=new Uint8Array(arrayBuffer);if(data.length<14)return null;var pos=0;var read32=function(){var v=data[pos]<<24|data[pos+1]<<16|data[pos+2]<<8|data[pos+3];pos+=4;return v;};var read16=function(){var v=data[pos]<<8|data[pos+1];pos+=2;return v;};var readVLQ=function(){var v=0,b;do{b=data[pos++];v=v<<7|b&0x7f;}while(b&0x80);return v;};var header=String.fromCharCode(data[0],data[1],data[2],data[3]);if(header!=='MThd')return null;pos=8;var fmt=read16();var numTracks=read16();var division=read16();var ticksPerBeat=division&0x8000?480:division||480;var bpm=120;var result=[];for(var t=0;t<numTracks;t++){if(pos+8>data.length)break;var trkId=String.fromCharCode(data[pos],data[pos+1],data[pos+2],data[pos+3]);pos+=4;var trkLen=read32();var endPos=Math.min(pos+trkLen,data.length);if(trkId!=='MTrk'){pos=endPos;continue;}var absTicks=0;var runningStatus=0;var trackName='MIDI Track '+(t+1);var midiNotes=[];var pendingNotes={};var maxAbsTick=0;while(pos<endPos){try{var delta=readVLQ();absTicks+=delta;var status=data[pos];if(status>=0x80){if(status<0xf0){runningStatus=status;}pos++;}else{status=runningStatus;}var cmd=status>>4;if(cmd===0x9||cmd===0x8){var chan=status&0x0F;var pitch=data[pos++];var vel=pos<endPos?data[pos++]:0;var noteKey=chan+'_'+pitch;if(cmd===0x9&&vel>0){pendingNotes[noteKey]={tick:absTicks,vel:vel};if(absTicks>maxAbsTick)maxAbsTick=absTicks;}else{var pn=pendingNotes[noteKey];if(pn){var durTicks=absTicks-pn.tick;if(durTicks<=0)durTicks=240;midiNotes.push({id:'mn_'+t+'_'+pitch+'_'+pn.tick,pitch:pitch,start_beat:pn.tick/ticksPerBeat,duration_beats:durTicks/ticksPerBeat,velocity:Math.min(1,pn.vel/127)});delete pendingNotes[noteKey];}}}else if(status>=0xc0&&status<0xe0){if(pos<endPos)pos+=1;}else if(status>=0xe0&&status<0xf0){if(pos+2<=endPos)pos+=2;}else if(status>=0xa0&&status<0xc0){if(pos+2<=endPos)pos+=2;}else if(status>=0xf0&&status<0xf8){if(pos<endPos){var sl=readVLQ();pos+=sl;}}else if(status===0xff){if(pos>=endPos)break;var metaType=data[pos++];var metaLen=readVLQ();if(metaType===0x03){try{trackName=String.fromCharCode.apply(null,Array.from(data.subarray(pos,pos+metaLen)));}catch(e){}}else if(metaType===0x51&&pos+3<=endPos){bpm=Math.round(60000000/(data[pos]<<16|data[pos+1]<<8|data[pos+2]));}pos+=Math.min(metaLen,endPos-pos);}else{if(pos+2<=endPos)pos+=2;}}catch(e){pos=endPos;}}Object.keys(pendingNotes).forEach(function(k){var pn=pendingNotes[k];var parts=k.split('_');var p=parseInt(parts[1]);var dur=Math.max(240,maxAbsTick-pn.tick);midiNotes.push({id:'mn_'+t+'_'+p+'_'+pn.tick,pitch:p,start_beat:pn.tick/ticksPerBeat,duration_beats:dur/ticksPerBeat,velocity:Math.min(1,pn.vel/127)});});if(midiNotes.length>0){var lastEnd=0;midiNotes.forEach(function(n){var e=(n.start_beat+n.duration_beats)*60/bpm;if(e>lastEnd)lastEnd=e;});result.push({name:trackName,notes:midiNotes,duration:lastEnd||4,startTime:0,id:'midi_'+t+'_'+Date.now()});}pos=endPos;}return result.length>0?result:null;};// ── Load File on Track (with server upload) ──
+const parseMidiFile=arrayBuffer=>{const data=new Uint8Array(arrayBuffer);if(data.length<14)return null;var pos=0;var read32=function(){var v=data[pos]<<24|data[pos+1]<<16|data[pos+2]<<8|data[pos+3];pos+=4;return v;};var read16=function(){var v=data[pos]<<8|data[pos+1];pos+=2;return v;};var readVLQ=function(){var v=0,b;do{b=data[pos++];v=v<<7|b&0x7f;}while(b&0x80);return v;};var header=String.fromCharCode(data[0],data[1],data[2],data[3]);if(header!=='MThd')return null;pos=8;var fmt=read16();var numTracks=read16();var division=read16();var ticksPerBeat=division&0x8000?480:division||480;var bpm=120;var result=[];for(var t=0;t<numTracks;t++){if(pos+8>data.length)break;var trkId=String.fromCharCode(data[pos],data[pos+1],data[pos+2],data[pos+3]);pos+=4;var trkLen=read32();var endPos=Math.min(pos+trkLen,data.length);if(trkId!=='MTrk'){pos=endPos;continue;}var absTicks=0;var runningStatus=0;var trackName='MIDI Track '+(t+1);var midiNotes=[];var pendingNotes={};var maxAbsTick=0;while(pos<endPos){try{var delta=readVLQ();absTicks+=delta;var status=data[pos];if(status>=0x80){if(status<0xf0){runningStatus=status;}pos++;}else{status=runningStatus;}var cmd=status>>4;if(cmd===0x9||cmd===0x8){var chan=status&0x0F;var pitch=data[pos++];var vel=pos<endPos?data[pos++]:0;var noteKey=chan+'_'+pitch;if(cmd===0x9&&vel>0){pendingNotes[noteKey]={tick:absTicks,vel:vel};if(absTicks>maxAbsTick)maxAbsTick=absTicks;}else{var pn=pendingNotes[noteKey];if(pn){var durTicks=absTicks-pn.tick;if(durTicks<=0)durTicks=240;midiNotes.push({id:'mn_'+t+'_'+pitch+'_'+pn.tick,pitch:pitch,start_beat:pn.tick/ticksPerBeat,duration_beats:durTicks/ticksPerBeat,velocity:Math.min(1,pn.vel/127)});delete pendingNotes[noteKey];}}}else if(status>=0xc0&&status<0xe0){if(pos<endPos)pos+=1;}else if(status>=0xe0&&status<0xf0){if(pos+2<=endPos)pos+=2;}else if(status>=0xa0&&status<0xc0){if(pos+2<=endPos)pos+=2;}else if(status>=0xf0&&status<0xf8){if(pos<endPos){var sl=readVLQ();pos+=sl;}}else if(status===0xff){if(pos>=endPos)break;var metaType=data[pos++];var metaLen=readVLQ();if(metaType===0x03){try{trackName=String.fromCharCode.apply(null,Array.from(data.subarray(pos,pos+metaLen)));}catch(e){}}else if(metaType===0x51&&pos+3<=endPos){bpm=Math.round(60000000/(data[pos]<<16|data[pos+1]<<8|data[pos+2]));}pos+=Math.min(metaLen,endPos-pos);}else{if(pos+2<=endPos)pos+=2;}}catch(e){pos=endPos;}}Object.keys(pendingNotes).forEach(function(k){var pn=pendingNotes[k];var parts=k.split('_');var p=parseInt(parts[1]);var dur=Math.max(240,maxAbsTick-pn.tick);midiNotes.push({id:'mn_'+t+'_'+p+'_'+pn.tick,pitch:p,start_beat:pn.tick/ticksPerBeat,duration_beats:dur/ticksPerBeat,velocity:Math.min(1,pn.vel/127)});});if(midiNotes.length>0){var lastEnd=0;midiNotes.forEach(function(n){var e=(n.start_beat+n.duration_beats)*60/bpm;if(e>lastEnd)lastEnd=e;});result.push({name:trackName,notes:midiNotes,duration:lastEnd||4,startTime:0,id:'midi_'+t+'_'+Date.now()});}pos=endPos;}return result.length>0?result:null;};window.parseMidiFile=parseMidiFile;// ── Load File on Track (with server upload) ──
 const loadFileOnTrack=async(trackId,file)=>{if(!file)return;var fileName=file.name||'';var isMidi=/\.mid$|\.midi$/i.test(fileName);showToast(`Đang nạp file ${fileName}...`,'info');try{if(isMidi){var arrayBuffer=await file.arrayBuffer();var midiResult=parseMidiFile(arrayBuffer);if(!midiResult||midiResult.length===0){showToast('Không tìm thấy nốt nhạc trong file MIDI.','error');return;}if(midiResult.length===1){updateActiveTracks(prev=>prev.map(function(t){if(t.id!==trackId)return t;return{...t,name:fileName,midiItems:[midiResult[0]]};}));showToast('Đã tải MIDI: '+fileName,'success');}else{var colors=['#0f766e','#1d4ed8','#701a75','#a21caf','#b45309','#ca8a04','#dc2626','#0891b2'];var firstDone=false;midiResult.forEach(function(midiItem,idx){if(!firstDone){updateActiveTracks(prev=>prev.map(function(t){if(t.id!==trackId)return t;return{...t,name:midiItem.name||fileName,midiItems:[midiItem]};}));firstDone=true;}else{var newId='midi_track_'+Date.now()+'_'+idx;updateActiveTracks(function(prev){var curLen=prev.length;return prev.concat([{id:newId,name:midiItem.name||'MIDI Track '+(idx+1),buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:colors[idx%colors.length],markers:[],serverFileId:null,clips:[],sections:[],midiItems:[midiItem],isArmed:false,monitoringEnabled:true,inputSource:{deviceType:'NONE',deviceId:''}}]);});}});showToast('Đã tải MIDI: '+midiResult.length+' tracks from '+fileName,'success');}return;}// Upload to server
 uploadToServer(file,trackId);// Decode locally for playback + analyze channels (stereo/mono)
 const{audioBuffer:decodedBuffer,channelInfo}=await window.SonicAudio.decodeAudioFile(file);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,name:fileName,buffer:decodedBuffer,channelInfo:channelInfo}:t));showToast(`Nạp file thành công: ${fileName} (${channelInfo.label})`,'success');}catch(err){showToast(isMidi?"Lỗi giải mã MIDI.":"Lỗi giải mã âm thanh. Định dạng file không tương thích.",'error');}};// ── Drop MIDI file → create new track(s) ──
diff --git a/app/templates/index.html b/app/templates/index.html
index 9b46a28..0be1204 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -23,7 +23,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608021650" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608021715" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {
diff --git a/wiki.md b/wiki.md
index f8da0c2..a401b6a 100644
--- a/wiki.md
+++ b/wiki.md
@@ -1104,3 +1104,8 @@
 - **Tóm tắt thay đổi:** `MediaExplorerPanel`: (1) `handleSelect` giờ clear ngay `setPeaks(null)` + `setAudioBuffer(null)` + `stopMediaPlayback()` khi chọn file mới → canvas xóa dữ liệu cũ ngay; (2) thêm `selectTokenRef` guard async race: `loadWaveform` và `playSelected` check token sau mỗi await, kết quả cũ (file trước) không ghi đè file mới chọn; (3) gọi `drawCanvas` qua effect phụ thuộc `[peaks, audioBuffer, selected]` → vẽ lại realtime.
 - **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js`, `app/templates/index.html`
 - **Ghi chú/Test (nếu có):** Smoke jsdom: click file → row selected + metadata MIDI events hiển thị; switch nhanh liên tục → file cuối đúng được chọn, không bị race. Hard reload.
+
+### [2026-08-02 17:15] Task: Media Explorer — persist tree width, canvas realtime, Synth instrument cho MIDI
+- **Tóm tắt thay đổi:** (1) Tree width lưu vào `localStorage['studio_media_explorer_tree_width']` khi kéo resize (onUp), khởi tạo đọc lại — reload vẫn giữ độ rộng. (2) Canvas cập nhật realtime khi click file: clear `peaks`/`audioBuffer`/`midiNotes` ngay khi chọn + `selectTokenRef` chống race async; MIDI real vẽ piano-roll nốt thật (màu xám theo pitch 48-84). (3) Nút **Synth** cạnh Auto-Play: dropdown chọn SoundFont + preset (load qua `listPlugins`+`listSoundfontInstruments`), lưu vào `localStorage['studio_media_explorer_synth']`; preview MIDI file thật play qua `window.SonicSF.playNote` với instrument đã chọn (`parseMidiFile` expose ra `window.parseMidiFile` vì nằm trong App scope).
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js`, `app/templates/index.html`
+- **Ghi chú/Test (nếu có):** Smoke jsdom: tree resize → localStorage `276`; Synth dropdown hiện Piano/Grand → chọn persisted; click `tune.mid` → SonicSF.playNote gọi với program 0. Hard reload.