diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 2d834f4..6494982 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -173,7 +173,6 @@
         stopNote: function (channel, pitch) {
             if (channel < 0 || channel > 15) return;
             if (_initialized && _synthInstance) {
-                try { _synthInstance.noteOff(channel, pitch, 127); } catch (e) {}
                 try { _synthInstance.noteOff(channel, pitch); } catch (e) {}
                 try { _synthInstance.noteOff(channel, pitch, 0); } catch (e) {}
                 try { _synthInstance.allNotesOff(channel); } catch (e) {}
@@ -182,11 +181,24 @@
         },
 
         playNote: function (note, velocity, durationMs, startTime, program, destinationNode, channel, synthEngine) {
-            if (_initialized && _synthInstance) {
-                this._playNoteSpessa(note, velocity, durationMs, startTime, program, channel, synthEngine);
+            if (!_initialized || !_synthInstance) {
+                // Try auto-init — create AudioContext + SpessaSynth
+                this._lazyInit();
+                // Use oscillator as fallback (short duration for keyboard preview)
+                this._playNoteOsc(note, velocity, 2000, startTime, program, destinationNode, channel, synthEngine);
                 return;
             }
-            this._playNoteOsc(note, velocity, durationMs, startTime, program, destinationNode, channel, synthEngine);
+            this._playNoteSpessa(note, velocity, durationMs, startTime, program, channel, synthEngine);
+        },
+
+        _lazyInit: async function () {
+            if (_initialized && _synthInstance) return;
+            if (_initPromise) return;
+            try {
+                const ctx = new (window.AudioContext || window.webkitAudioContext)();
+                if (ctx.state === 'suspended') await ctx.resume();
+                await this.init(ctx);
+            } catch (e) {}
         },
 
         _playNoteSpessa: function (note, velocity, durationMs, startTime, program, channel, synthEngine) {