T6: scheduler items qua router - note-on/off TIMELINE_SCHEDULER (startTime audio clock support trong router+TrackInstrument); 8 site scheduler (timeline/section/local/piano-roll/ghost) route UnifiedMidiRouter, fallback SonicSF, tracker doi xung qua note-off setTimeout

app/static/js/services/trackInstrument.js

@@ -33,12 +33,12 @@ window.TrackInstrument = window.TrackInstrument || {};
         }
     };
 
-    TrackInstrument.prototype.playNote = function (pitch, velocity, durationMs) {
+    TrackInstrument.prototype.playNote = function (pitch, velocity, durationMs, startTime) {
         try {
             if (!window.SonicSF || !window.SonicSF.playNote) return;
             this._ensure();
             var dur = (durationMs != null ? durationMs : 500) || 500;
-            window.SonicSF.playNote(pitch, velocity != null ? velocity : 0.8, dur, undefined, this.program, this.dest, this.ch, this.synthEngine);
+            window.SonicSF.playNote(pitch, velocity != null ? velocity : 0.8, dur, startTime, this.program, this.dest, this.ch, this.synthEngine);
         } catch (e) {
             console.warn('[TrackInstrument] playNote error:', e);
         }

app/static/js/services/unifiedMidiRouter.js

@@ -76,7 +76,7 @@ window.SonicUnifiedMidiRouter = window.SonicUnifiedMidiRouter || {};
             // Chỉ trigger âm ở note-on đầu tiên; các note-on trùng key chỉ tăng
             // count (sustain lặp) — note-off cuối cùng mới tắt voice.
             if (cur.count === 1 && engine && engine.playNote) {
-                try { engine.playNote(pitch, vel, evt.durationMs || 500); } catch (e) {}
+                try { engine.playNote(pitch, vel, evt.durationMs || 500, evt.startTime); } catch (e) {}
             }
             return true;
         }