fix: play MIDI item luôn dùng instrument của track chứa item - sửa startLocalTrackPlayback thiếu channel/synth_engine + đồng nhất assignTrackMidiChannel mọi đường phát

app/static/js/app.jsx

@@ -6226,7 +6226,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
             currentBeat < n.start_beat && newBeat >= n.start_beat
           );
           var pvTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-          var pvCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(pvTrk, activeTracks) : (pvTrk ? pvTrk.midiChannel : 0);
+          var pvCh = pvTrk ? assignTrackMidiChannel(pvTrk, activeTracks) : 0;
           playing.forEach(n => {
             window.SonicSF.playNote(n.pitch, (n.velocity || 0.8) * 127, 200, ctx.currentTime, st.instrumentProgram, null, pvCh, pvTrk ? pvTrk.synth_engine : undefined);
           });
@@ -6560,7 +6560,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
       if (window.SonicSF) {
         const ctx = getAudioContext();
         var clTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-        var clCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(clTrk, activeTracks) : (clTrk ? clTrk.midiChannel : 0);
+        var clCh = clTrk ? assignTrackMidiChannel(clTrk, activeTracks) : 0;
         window.SonicSF.playNote(notes[clickedNoteIdx].pitch, 100, 300, ctx.currentTime, st.instrumentProgram, null, clCh, clTrk ? clTrk.synth_engine : undefined);
       }
     }
@@ -6784,7 +6784,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
       if (window.SonicSF && window.SonicSF._playNoteFallback) {
         const ctx = getAudioContext();
         var dwTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-        var dwCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(dwTrk, activeTracks) : (dwTrk ? dwTrk.midiChannel : 0);
+        var dwCh = dwTrk ? assignTrackMidiChannel(dwTrk, activeTracks) : 0;
         var dwPitch = snapToScaleRef.current ? snapPitchToScale(pitch, selectedScaleRef.current) : pitch;
         var dwDurMs = Math.max(100, Math.round(initialDur * (60 / bpm) * 1000));
         var dwNodes = window.SonicSF._playNoteFallback(dwPitch, Math.round(brushVelocityRef.current * 127), dwDurMs, ctx.currentTime, dwTrk ? dwTrk.instrumentProgram : undefined, null, dwCh, dwTrk ? dwTrk.synth_engine : undefined);
@@ -6880,7 +6880,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         if (window.SonicSF && window.SonicSF._playNoteFallback) {
           var pvCtx = getAudioContext();
           var pvTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-          var pvCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(pvTrk, activeTracks) : (pvTrk ? pvTrk.midiChannel : 0);
+          var pvCh = pvTrk ? assignTrackMidiChannel(pvTrk, activeTracks) : 0;
           var pvVel = Math.round(brushVelocityRef.current * 127);
           var pvNodes = window.SonicSF._playNoteFallback(p, pvVel, durMs, pvCtx.currentTime, pvTrk ? pvTrk.instrumentProgram : undefined, null, pvCh, pvTrk ? pvTrk.synth_engine : undefined);
           if (pvNodes) previewNodesRef.current = pvNodes;
@@ -7197,7 +7197,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
 
   const renderKeybed = () => {
     var kbTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-    var kbCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(kbTrk, activeTracks) : (kbTrk ? kbTrk.midiChannel : 0);
+    var kbCh = kbTrk ? assignTrackMidiChannel(kbTrk, activeTracks) : 0;
     var kbSynth = kbTrk ? kbTrk.synth_engine : undefined;
     const keys = [];
     for (let pitch = 127; pitch >= PITCH_START; pitch--) {
@@ -15373,7 +15373,7 @@ const App = () => {
     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);
+    var prevCh = track ? assignTrackMidiChannel(track, activeTracks) : 0;
     window.SonicSF.playNote(
       pitch,
       velocity,
@@ -15426,7 +15426,7 @@ 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, allPlayTracks) : (track.midiChannel !== undefined ? track.midiChannel : 0);
+        var trkCh = assignTrackMidiChannel(track, allPlayTracks);
         // 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);
@@ -15566,7 +15566,7 @@ const App = () => {
                   if (noteStartMain >= secStart && noteStartMain < secEnd && offsetTime < noteEndMain) {
                     const notePlayEndMain = Math.min(noteEndMain, secEnd);
                     const program = subTrack.instrumentProgram;
-                    var subCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(subTrack, secTracks) : (subTrack.midiChannel !== undefined ? subTrack.midiChannel : (subIdx % 16));
+                    var subCh = assignTrackMidiChannel(subTrack, secTracks);
 
                     if (offsetTime < noteStartMain) {
                       const delay = noteStartMain - offsetTime;
@@ -15645,6 +15645,7 @@ const App = () => {
     // MIDI items playback
     const midiItems = track.midiItems || [];
     if ((track.type === 'MIDI' || midiItems.length > 0) && window.SonicSF) {
+      var lcCh = assignTrackMidiChannel(track, tracks);
       const bpmVal = parseInt(bpm) || 120;
       const secondsPerBeat = 60.0 / bpmVal;
       midiItems.forEach(item => {
@@ -15665,7 +15666,9 @@ const App = () => {
                 durationMs,
                 startTime,
                 program,
-                gainNode
+                gainNode,
+                lcCh,
+                track.synth_engine
               );
             } else {
               const remainingDurMs = (noteEndSec - offsetTime) * 1000;
@@ -15675,7 +15678,9 @@ const App = () => {
                 remainingDurMs,
                 context.currentTime,
                 program,
-                gainNode
+                gainNode,
+                lcCh,
+                track.synth_engine
               );
             }
           }
@@ -15695,7 +15700,7 @@ const App = () => {
     const instrumentProgram = track ? track.instrumentProgram : undefined;
     const synthEngine = track ? track.synth_engine : undefined;
     var allTracks = activeTracksRef.current || [];
-    var mainCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(track, allTracks) : (track ? track.midiChannel : 0);
+    var mainCh = track ? assignTrackMidiChannel(track, allTracks) : 0;
     // Compute session beat offset from target item
     var sessionBeatOffset = 0;
     var targetTrk = allTracks.find(function(t) { return t.id === st.trackId; });
@@ -15726,14 +15731,7 @@ const App = () => {
       var ghostSynth = layer.synthEngine || (ghostTrack ? ghostTrack.synth_engine : undefined);
       if (ghostProg === undefined && !ghostSynth) return;
       var ghostDest = getOrCreateTrackNode(ghostTrack, context);
-      var ghostCh = 0;
-      if (ghostTrack) {
-        if (ghostTrack.midiChannel !== undefined) {
-          ghostCh = ghostTrack.midiChannel;
-        } else {
-          ghostCh = window.SonicPianoRoll ? window.SonicPianoRoll.getTrackMidiChannel(ghostTrack, allTracks) : (ghostTrack ? ghostTrack.midiChannel : 0);
-        }
-      }
+      var ghostCh = ghostTrack ? assignTrackMidiChannel(ghostTrack, allTracks) : 0;
       layer.notes.forEach(function(note) {
         var beat = (note.start_beat || 0) + sessionBeatOffset;
         var dur = note.duration_beats || 1;