diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 11c7799..0ee05eb 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -194,15 +194,16 @@
             const now = ctx.currentTime;
             const delay = (typeof startTime === 'number' && startTime > now) ? (startTime - now) : 0;
             const noteId = { on: null, off: null };
-            _scheduledNotes.push(noteId);
             const doNote = () => {
                 try {
                     _synthInstance.noteOn(channel, midiPitch, midiVel);
-                    noteId.off = setTimeout(() => {
-                        try { _synthInstance.noteOff(channel, midiPitch); } catch (e) {}
-                        const idx = _scheduledNotes.indexOf(noteId);
-                        if (idx >= 0) _scheduledNotes.splice(idx, 1);
-                    }, durSec * 1000);
+                    // Scheduled notes (timeline playback): auto noteOff after duration
+                    // Immediate notes (MIDI keyboard): keep sounding until stopNote/stopAll
+                    if (delay > 0) {
+                        noteId.off = setTimeout(() => {
+                            try { _synthInstance.noteOff(channel, midiPitch); } catch (e) {}
+                        }, durSec * 1000);
+                    }
                 } catch (e) {
                     console.warn("[SonicSF] SpessaSynth noteOn error:", e);
                     this._playNoteOsc(note, velocity, durationMs, startTime, program, null, channel, synthEngine);
@@ -210,10 +211,9 @@
             };
             if (delay > 0) {
                 noteId.on = setTimeout(doNote, delay * 1000);
+                _scheduledNotes.push(noteId);
             } else {
                 doNote();
-                const idx = _scheduledNotes.indexOf(noteId);
-                if (idx >= 0) _scheduledNotes.splice(idx, 1);
             }
         },