fix: MIDI NoteOff stops note immediately (60000ms duration + stopNote)

- NoteOn: durationMs=60000 (1 phút, giữ cho đến khi NoteOff)
- NoteOff: stopNote(ch, pitch) gọi synthInstance.noteOff() ngay
- MIDI channel (msg.data[0] & 0x0F) truyền đúng vào playNote
- CC (sustain/modulation) + pitch bend forward qua SpessaSynth

app/static/js/app.jsx

@@ -6761,26 +6761,31 @@ const App = () => {
                    const ch = msg.data[0] & 0x0F;
                    const arSub = subTabsRef && subTabsRef.current && activeTabRef && subTabsRef.current.find(s => s.id === activeTabRef.current && s.type === 'PIANO_ROLL' && s.isArmed);
                    if (arSub) {
-                     window.SonicSF.playNote(pitch, velocity, 500, undefined, arSub.instrumentProgram, null, undefined, arSub.synth_engine);
+                     window.SonicSF.playNote(pitch, velocity, 60000, undefined, arSub.instrumentProgram, null, ch, arSub.synth_engine);
                    } else {
                      const armedTrack = activeTracksRef.current ? activeTracksRef.current.find(t => t.isArmed) : null;
                      if (armedTrack) {
                        const prog = armedTrack.instrumentProgram;
                        const se = armedTrack.synth_engine;
                        const dest = activeTrackNodesRef.current[armedTrack.id]?.gainNode || null;
-                       window.SonicSF.playNote(pitch, velocity, 500, undefined, prog, dest, undefined, se);
+                       window.SonicSF.playNote(pitch, velocity, 60000, undefined, prog, dest, ch, se);
                      }
                    }
                  } }
                } else if (cmd === 0x8 || (cmd === 0x9 && velocity === 0)) {
-                activeMidiPitchesRef.current.delete(pitch);
+                 activeMidiPitchesRef.current.delete(pitch);
-                setActiveMidiPitches(new Set(activeMidiPitchesRef.current));
+                 setActiveMidiPitches(new Set(activeMidiPitchesRef.current));
-                const current = lastMidiNoteRef.current;
+                 const current = lastMidiNoteRef.current;
-              if (current && current.pitch === pitch) {
+               if (current && current.pitch === pitch) {
-                const lenSec = (performance.now() - current.startTime) / 1000;
+                 const lenSec = (performance.now() - current.startTime) / 1000;
-                lastMidiNoteRef.current = { ...current, length: lenSec };
+                 lastMidiNoteRef.current = { ...current, length: lenSec };
-                setLastMidiNote(prev => prev && prev.pitch === pitch ? { ...prev, length: lenSec, time: Date.now() } : prev);
+                 setLastMidiNote(prev => prev && prev.pitch === pitch ? { ...prev, length: lenSec, time: Date.now() } : prev);
-              }
+               }
+               // Stop the note immediately via SpessaSynth
+               if (window.SonicSF && window.SonicSF.stopNote) {
+                 const ch = msg.data[0] & 0x0F;
+                 window.SonicSF.stopNote(ch, pitch);
+               }
               }
             }
 

app/static/js/services/soundfontPlayer.js

@@ -161,6 +161,13 @@
             }
         },
 
+        stopNote: function (channel, pitch) {
+            if (channel < 0 || channel > 15) return;
+            if (_initialized && _synthInstance) {
+                try { _synthInstance.noteOff(channel, pitch); } catch (e) {}
+            }
+        },
+
         playNote: function (note, velocity, durationMs, startTime, program, destinationNode, channel, synthEngine) {
             if (_initialized && _synthInstance) {
                 this._playNoteSpessa(note, velocity, durationMs, startTime, program, channel, synthEngine);