diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 6494982..3b16690 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -173,10 +173,14 @@
         stopNote: function (channel, pitch) {
             if (channel < 0 || channel > 15) return;
             if (_initialized && _synthInstance) {
+                // Ensure sustain is OFF before noteOff (SpessaSynth uses >=8192 threshold)
+                try { _synthInstance.controllerChange(channel, 64, 0); } catch (e) {}
+                // Standard noteOff with multiple velocity variants
                 try { _synthInstance.noteOff(channel, pitch); } catch (e) {}
                 try { _synthInstance.noteOff(channel, pitch, 0); } catch (e) {}
-                try { _synthInstance.allNotesOff(channel); } catch (e) {}
+                // Backup: All Notes Off + reset controllers
                 try { _synthInstance.controllerChange(channel, 123, 0); } catch (e) {}
+                try { _synthInstance.controllerChange(channel, 121, 0); } catch (e) {}
             }
         },