diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 3b16690..57d6763 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -175,12 +175,12 @@
             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
+                // Standard MIDI noteOff for the specific pitch — enters SoundFont release envelope
                 try { _synthInstance.noteOff(channel, pitch); } catch (e) {}
-                try { _synthInstance.noteOff(channel, pitch, 0); } catch (e) {}
-                // Backup: All Notes Off + reset controllers
-                try { _synthInstance.controllerChange(channel, 123, 0); } catch (e) {}
-                try { _synthInstance.controllerChange(channel, 121, 0); } catch (e) {}
+                // Force immediate voice kill: CC 120 (All Sound Off) sets isActive=false instantly,
+                // bypassing the release envelope. CC 123 (All Notes Off) merely enters the release
+                // phase which respects long release tails (2-5s for sustained instruments).
+                try { _synthInstance.controllerChange(channel, 120, 0); } catch (e) {}
             }
         },
 
@@ -321,7 +321,7 @@
 
         stopAll: function () {
             if (_initialized && _synthInstance) {
-                try { for (let ch = 0; ch < 16; ch++) _synthInstance.allNotesOff(ch); } catch (e) {}
+                try { for (let ch = 0; ch < 16; ch++) _synthInstance.controllerChange(ch, 120, 0); } catch (e) {}
             }
             // Cancel all scheduled future notes
             while (_scheduledNotes.length > 0) {