feat: realtime solo toggle during playback

app/static/js/app.jsx

@@ -13321,8 +13321,9 @@ const App = () => {
 
   const startTrackPlayback = offsetTime => {
     const context = getAudioContext();
-    const hasSolo = activeTracks.some(t => t.solo);
+    const allPlayTracks = activeTracksRef.current && activeTracksRef.current.length ? activeTracksRef.current : activeTracks;
-    activeTracks.forEach(track => {
+    const hasSolo = allPlayTracks.some(t => t.solo);
+    allPlayTracks.forEach(track => {
       const isPlayable = hasSolo ? track.solo : !track.muted;
       if (!isPlayable) return;
 
@@ -13358,7 +13359,7 @@ const App = () => {
       // MIDI items playback
       const midiItems = track.midiItems || [];
       if ((track.type === 'MIDI' || midiItems.length > 0) && window.SonicSF) {
-        var trkCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(track, activeTracks) : (track.midiChannel !== undefined ? track.midiChannel : 0);
+        var trkCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(track, allPlayTracks) : (track.midiChannel !== undefined ? track.midiChannel : 0);
         // Ensure instrument is loaded in FluidSynth
         if (track.synth_engine && track.synth_engine.type === 'soundfont' && track.synth_engine.soundfont_id) {
           window.SonicSF.selectInstrument(trkCh, track.synth_engine.soundfont_bank || 0, track.synth_engine.soundfont_program || 0, track.synth_engine.soundfont_id);
@@ -15461,17 +15462,33 @@ const App = () => {
   // ── Track Controls ──
   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
     ));
-    if (wasPlaying) {
+    setTimeout(() => {
-      setTimeout(() => {
+      const soloCtx = getAudioContext();
+      if (wasPlaying) {
         startOffsetTimeRef.current = currentTime;
-        startAudioTimeRef.current = getAudioContext().currentTime;
+        startAudioTimeRef.current = soloCtx.currentTime;
+        startBufferOffsetRef.current = currentTime;
         setIsPlaying(true);
-      }, 50);
+        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 => {

app/static/js/app.precompiled.js

@@ -360,8 +360,8 @@ if(!selectionCleared&&isLoopingSelection&&selLeft!==null&&selRight!==null){if(se
 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;let node=activeTrackNodesRef.current[track.id];if(!node){const gainNode=context.createGain();const volDb=track.volumeDb??0;const volLinear=volDb<=-50?0:Math.pow(10,volDb/20);gainNode.gain.setValueAtTime(volLinear,context.currentTime);const pannerNode=context.createStereoPanner();pannerNode.pan.setValueAtTime((track.pan??0)/100,context.currentTime);// Ensure master bus is initialized for MAIN OUT routing
 if(!masterBus)initMasterBus(context);// Route through master bus if available, else direct to destination
-const dest=masterBus?masterBus.input:context.destination;const analyserNode=context.createAnalyser();analyserNode.fftSize=256;pannerNode.connect(analyserNode);analyserNode.connect(dest);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,analyserNode};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;const context=getAudioContext();const tab=subTabs.find(s=>s.id===activeTabRef.current);const trackId=tab?tab.trackId:selectedTrackId;const track=activeTracks.find(t=>t.id===trackId);const destNode=getOrCreateTrackNode(track,context);const program=track?track.instrumentProgram:undefined;var prevCh=window.SonicPianoRoll?window.SonicPianoRoll.getTrackMidiChannel(track,activeTracks):track?track.midiChannel:0;window.SonicSF.playNote(pitch,velocity,durationMs,context.currentTime,program,destNode,prevCh,track?track.synth_engine:undefined);};const startTrackPlayback=offsetTime=>{const context=getAudioContext();const hasSolo=activeTracks.some(t=>t.solo);activeTracks.forEach(track=>{const isPlayable=hasSolo?track.solo:!track.muted;if(!isPlayable)return;const gainNode=getOrCreateTrackNode(track,context);const pannerNode=activeTrackNodesRef.current[track.id].pannerNode;const clips=track.clips&&track.clips.length>0?track.clips:track.buffer?[{id:'default',buffer:track.buffer,startTime:track.startTime||0,name:track.name,speed:track.speed||1.0}]:[];clips.forEach(clip=>{if(!clip.buffer)return;const source=context.createBufferSource();source.buffer=clip.buffer;source.playbackRate.value=clip.speed||1.0;source.connect(gainNode);const clipStart=clip.startTime||0;const clipDuration=clip.buffer.duration/(clip.speed||1.0);const clipEnd=clipStart+clipDuration;if(offsetTime<clipStart){const delay=clipStart-offsetTime;source.start(context.currentTime+delay,0);activeSourcesRef.current.push(source);}else if(offsetTime<clipEnd){const playOffset=offsetTime-clipStart;source.start(context.currentTime,playOffset*(clip.speed||1.0));activeSourcesRef.current.push(source);}});// MIDI items playback
+const dest=masterBus?masterBus.input:context.destination;const analyserNode=context.createAnalyser();analyserNode.fftSize=256;pannerNode.connect(analyserNode);analyserNode.connect(dest);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,analyserNode};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;const context=getAudioContext();const tab=subTabs.find(s=>s.id===activeTabRef.current);const trackId=tab?tab.trackId:selectedTrackId;const track=activeTracks.find(t=>t.id===trackId);const destNode=getOrCreateTrackNode(track,context);const program=track?track.instrumentProgram:undefined;var prevCh=window.SonicPianoRoll?window.SonicPianoRoll.getTrackMidiChannel(track,activeTracks):track?track.midiChannel:0;window.SonicSF.playNote(pitch,velocity,durationMs,context.currentTime,program,destNode,prevCh,track?track.synth_engine:undefined);};const startTrackPlayback=offsetTime=>{const context=getAudioContext();const allPlayTracks=activeTracksRef.current&&activeTracksRef.current.length?activeTracksRef.current:activeTracks;const hasSolo=allPlayTracks.some(t=>t.solo);allPlayTracks.forEach(track=>{const isPlayable=hasSolo?track.solo:!track.muted;if(!isPlayable)return;const gainNode=getOrCreateTrackNode(track,context);const pannerNode=activeTrackNodesRef.current[track.id].pannerNode;const clips=track.clips&&track.clips.length>0?track.clips:track.buffer?[{id:'default',buffer:track.buffer,startTime:track.startTime||0,name:track.name,speed:track.speed||1.0}]:[];clips.forEach(clip=>{if(!clip.buffer)return;const source=context.createBufferSource();source.buffer=clip.buffer;source.playbackRate.value=clip.speed||1.0;source.connect(gainNode);const clipStart=clip.startTime||0;const clipDuration=clip.buffer.duration/(clip.speed||1.0);const clipEnd=clipStart+clipDuration;if(offsetTime<clipStart){const delay=clipStart-offsetTime;source.start(context.currentTime+delay,0);activeSourcesRef.current.push(source);}else if(offsetTime<clipEnd){const playOffset=offsetTime-clipStart;source.start(context.currentTime,playOffset*(clip.speed||1.0));activeSourcesRef.current.push(source);}});// MIDI items playback
-const midiItems=track.midiItems||[];if((track.type==='MIDI'||midiItems.length>0)&&window.SonicSF){var trkCh=window.SonicPianoRoll?window.SonicPianoRoll.getTrackMidiChannel(track,activeTracks):track.midiChannel!==undefined?track.midiChannel:0;// Ensure instrument is loaded in FluidSynth
+const midiItems=track.midiItems||[];if((track.type==='MIDI'||midiItems.length>0)&&window.SonicSF){var trkCh=window.SonicPianoRoll?window.SonicPianoRoll.getTrackMidiChannel(track,allPlayTracks):track.midiChannel!==undefined?track.midiChannel:0;// Ensure instrument is loaded in FluidSynth
 if(track.synth_engine&&track.synth_engine.type==='soundfont'&&track.synth_engine.soundfont_id){window.SonicSF.selectInstrument(trkCh,track.synth_engine.soundfont_bank||0,track.synth_engine.soundfont_program||0,track.synth_engine.soundfont_id);}const bpmVal=parseInt(bpm)||120;const secondsPerBeat=60.0/bpmVal;midiItems.forEach(item=>{const itemEndSec=item.startTime+(item.duration||4);const notes=item.notes||[];notes.forEach(note=>{// note start/duration is in beats (for MIDI items)
 const noteStartSec=item.startTime+(note.start_beat||0)*secondsPerBeat;if(noteStartSec>=itemEndSec)return;// skip notes outside item's visual duration
 const noteDurSec=(note.duration_beats||1)*secondsPerBeat;const noteEndSec=noteStartSec+noteDurSec;if(offsetTime<noteEndSec){const durationMs=noteDurSec*1000;const program=track._isSectionClone?track.instrumentProgram:track.instrumentProgram!==undefined?track.instrumentProgram:0;if(offsetTime<noteStartSec){const delay=noteStartSec-offsetTime;const startTime=context.currentTime+delay;window.SonicSF.playNote(note.pitch||60,note.velocity||0.8,durationMs,startTime,program,gainNode,trkCh,track.synth_engine);// Trigger VU meter flash when the note starts playing
@@ -413,7 +413,7 @@ useEffect(()=>{const handleMouseMove=e=>{var pd=pendingDragRef.current;if(!pd)re
 useEffect(()=>{const handleMouseMove=e=>{const resize=resizedSectionItemRef.current;if(!resize)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);updateActiveTracks(prev=>prev.map(t=>{if(t.id!==resize.trackId)return t;const items=resize.itemType==='section'?[...(t.sections||[])]:[...(t.midiItems||[])];const idx=items.findIndex(it=>it.id===resize.itemId);if(idx===-1)return t;const item=items[idx];if(resize.side==='left'){const beatSec=60.0/(parseInt(bpm)||120);const newStart=Math.max(0,Math.min(time,resize.originalStart+resize.originalDuration-0.1));const end=resize.originalStart+resize.originalDuration;const newDuration=end-newStart;if(newDuration<0.1)return t;items[idx]=resize.itemType==='section'?{...item,start:newStart,duration:newDuration}:{...item,startTime:newStart,duration:newDuration};}else{const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const marginBar=maxDurationRef.current-secondsPerBar;const clampedTime=Math.min(time,marginBar);const snappedDuration=snapValueRef.current!=='free'?snapTime(clampedTime-resize.originalStart,snapValueRef.current,bpm):clampedTime-resize.originalStart;const newDuration=Math.max(0.1,snappedDuration);items[idx]={...item,duration:newDuration};}return resize.itemType==='section'?{...t,sections:items}:{...t,midiItems:items};}));setCanvasRedrawCount(n=>n+1);const edgePx=(resize.side==='left'?Math.max(0,time):time)*zoom;const keepMargin=80;if(edgePx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=edgePx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(edgePx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,edgePx-keepMargin);setCanvasRedrawCount(n=>n+1);}};const handleMouseUp=()=>{const resize=resizedSectionItemRef.current;if(!resize)return;setResizedSectionItem(null);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Sweep Select mousemove/mouseup ──
 useEffect(()=>{const handleMouseMove=e=>{if(!isSweepingRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);setSweepSelect(prev=>{var updated=prev?{...prev,endTime:time}:null;sweepSelectRef.current=updated;return updated;});};const handleMouseUp=()=>{if(!isSweepingRef.current)return;isSweepingRef.current=false;sweepTrackIdRef.current=null;const sweep=sweepSelectRef.current;sweepSelectRef.current=null;captureSelectionUndo();if(sweep){const start=Math.min(sweep.startTime,sweep.endTime);const end=Math.max(sweep.startTime,sweep.endTime);if(Math.abs(end-start)<0.02){setSelectedItemIds(new Set());setSweepSelect(null);pushSelectionUndo();return;}const curTracks=activeTracksRef.current||[];const found=new Set();curTracks.forEach(t=>{(t.midiItems||[]).forEach(m=>{if(m.startTime<end&&m.startTime+m.duration>start){found.add(m.id);}});(t.sections||[]).forEach(s=>{if(s.start<end&&s.start+s.duration>start){found.add(s.id);}});(t.clips||[]).forEach(c=>{const dur=c.buffer?c.buffer.duration/(c.speed||1.0):4;if(c.startTime<end&&c.startTime+dur>start){const cid=c.id==='default'?'default_'+t.id:c.id;found.add(cid);}});});setSelectedItemIds(prev=>{const next=new Set(prev);found.forEach(id=>{if(next.has(id))next.delete(id);else next.add(id);});return next;});setSweepSelect(null);sweepTrackIdRef.current=null;pushSelectionUndo();}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom]);const handleSelectRange=(start,end,reset)=>{captureSelectionUndo();const maxLen=maxDuration;const cleanStart=Math.max(0,Math.min(maxLen,start));const cleanEnd=Math.max(0,Math.min(maxLen,end));if(reset){setSelectionStart(cleanStart);setSelectionEnd(cleanEnd);}else{setSelectionEnd(cleanEnd);}setSelectionCleared(false);pushSelectionUndo();};const handleSelectionInputChange=(field,val)=>{captureSelectionUndo();const numericVal=Math.max(0,parseFloat(val)||0);if(selectionMode==='local'){if(field==='start'){setLocalSelectionStart(numericVal);}else{setLocalSelectionEnd(numericVal);}}else{if(field==='start'){setSelectionStart(numericVal);}else{setSelectionEnd(numericVal);}}pushSelectionUndo();};const selectionStats=useMemo(()=>{if(selLeft===null||selRight===null){return{start:0,end:0,length:0};}const s=Math.min(selLeft,selRight);const e=Math.max(selLeft,selRight);return{start:parseFloat(s.toFixed(3)),end:parseFloat(e.toFixed(3)),length:parseFloat((e-s).toFixed(3))};},[selLeft,selRight]);// ── Handle Drag (selection resize) ──
 const handleHandleDragStart=(e,side)=>{e.preventDefault();e.stopPropagation();const startX=e.clientX;const useLocal=selectionMode==='local';const currentStart=useLocal?localSelectionStart:selectionStart;const currentEnd=useLocal?localSelectionEnd:selectionEnd;const initialLeft=Math.min(currentStart,currentEnd);const initialRight=Math.max(currentStart,currentEnd);const setStart=useLocal?setLocalSelectionStart:setSelectionStart;const setEnd=useLocal?setLocalSelectionEnd:setSelectionEnd;const handleMouseMove=moveEvent=>{const deltaX=moveEvent.clientX-startX;const deltaSec=deltaX/zoom;if(side==='left'){const newLeft=Math.max(0,Math.min(initialRight-0.05,initialLeft+deltaSec));setStart(newLeft);setEnd(initialRight);}else{const newRight=Math.max(initialLeft+0.05,Math.min(maxDuration,initialRight+deltaSec));setStart(initialLeft);setEnd(newRight);}};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};const handleSelectionBodyDragStart=e=>{e.preventDefault();e.stopPropagation();const startX=e.clientX;const useLocal=selectionMode==='local';const currentStart=useLocal?localSelectionStart:selectionStart;const currentEnd=useLocal?localSelectionEnd:selectionEnd;const initialLeft=Math.min(currentStart,currentEnd);const initialRight=Math.max(currentStart,currentEnd);const widthSec=initialRight-initialLeft;const setStart=useLocal?setLocalSelectionStart:setSelectionStart;const setEnd=useLocal?setLocalSelectionEnd:setSelectionEnd;const handleMouseMove=moveEvent=>{const deltaX=moveEvent.clientX-startX;const deltaSec=deltaX/zoom;let newLeft=initialLeft+deltaSec;let newRight=initialRight+deltaSec;if(newLeft<0){newLeft=0;newRight=widthSec;}if(newRight>maxDuration){newRight=maxDuration;newLeft=maxDuration-widthSec;}setStart(newLeft);setEnd(newRight);};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};// ── Track Controls ──
-const toggleTrackSoloEvaluate=trackId=>{const wasPlaying=isPlaying;stopAllPlayback();setTracks(prev=>prev.map(t=>t.id===trackId?{...t,solo:!t.solo,muted:false}:t));if(wasPlaying){setTimeout(()=>{startOffsetTimeRef.current=currentTime;startAudioTimeRef.current=getAudioContext().currentTime;setIsPlaying(true);},50);}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 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) ──