diff --git a/assets/example_patches/808/cmaj_808.js b/assets/example_patches/808/cmaj_808.js
index d146171a..b8320c25 100644
--- a/assets/example_patches/808/cmaj_808.js
+++ b/assets/example_patches/808/cmaj_808.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch '808.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/808/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/808/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/808/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/808/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/CompuFart/cmaj_CompuFart.js b/assets/example_patches/CompuFart/cmaj_CompuFart.js
index eb56fc3a..520869af 100644
--- a/assets/example_patches/CompuFart/cmaj_CompuFart.js
+++ b/assets/example_patches/CompuFart/cmaj_CompuFart.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'CompuFartSynth.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/CompuFart/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/CompuFart/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/CompuFart/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/CompuFart/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/ElectricPiano/cmaj_Electric_Piano.js b/assets/example_patches/ElectricPiano/cmaj_Electric_Piano.js
index d9c8e91a..10341471 100644
--- a/assets/example_patches/ElectricPiano/cmaj_Electric_Piano.js
+++ b/assets/example_patches/ElectricPiano/cmaj_Electric_Piano.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'ElectricPiano.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/ElectricPiano/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/ElectricPiano/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/ElectricPiano/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/ElectricPiano/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/GuitarLSTM/cmaj_GuitarLSTM.js b/assets/example_patches/GuitarLSTM/cmaj_GuitarLSTM.js
index 025b11d3..548984c6 100644
--- a/assets/example_patches/GuitarLSTM/cmaj_GuitarLSTM.js
+++ b/assets/example_patches/GuitarLSTM/cmaj_GuitarLSTM.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'GuitarLSTM.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/GuitarLSTM/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/GuitarLSTM/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/GuitarLSTM/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/GuitarLSTM/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/HelloWorld/cmaj_Hello_World.js b/assets/example_patches/HelloWorld/cmaj_Hello_World.js
index b4623644..f1bddcc1 100644
--- a/assets/example_patches/HelloWorld/cmaj_Hello_World.js
+++ b/assets/example_patches/HelloWorld/cmaj_Hello_World.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'HelloWorld.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/HelloWorld/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/HelloWorld/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/HelloWorld/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/HelloWorld/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/Piano/cmaj_Piano.js b/assets/example_patches/Piano/cmaj_Piano.js
index 56661407..4897c1e4 100644
--- a/assets/example_patches/Piano/cmaj_Piano.js
+++ b/assets/example_patches/Piano/cmaj_Piano.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'Piano.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/Piano/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/Piano/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/Piano/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/Piano/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/PirkleFilters/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/PirkleFilters/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/PirkleFilters/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/PirkleFilters/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/PirkleFilters/cmaj_vafilters.js b/assets/example_patches/PirkleFilters/cmaj_vafilters.js
index 575ed667..953a99e2 100644
--- a/assets/example_patches/PirkleFilters/cmaj_vafilters.js
+++ b/assets/example_patches/PirkleFilters/cmaj_vafilters.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'vafilters.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/Pro54/cmaj_Pro54.js b/assets/example_patches/Pro54/cmaj_Pro54.js
index c1725851..d4000f26 100644
--- a/assets/example_patches/Pro54/cmaj_Pro54.js
+++ b/assets/example_patches/Pro54/cmaj_Pro54.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'Pro54.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/Pro54/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/Pro54/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/Pro54/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/Pro54/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/Pro54/gui/helpers/cmaj-image-strip-control.js b/assets/example_patches/Pro54/gui/helpers/cmaj-image-strip-control.js
index 114600c6..38d28b96 100644
--- a/assets/example_patches/Pro54/gui/helpers/cmaj-image-strip-control.js
+++ b/assets/example_patches/Pro54/gui/helpers/cmaj-image-strip-control.js
@@ -30,7 +30,7 @@ export default class ImageStripControl extends HTMLElement
         this.horizontalMode = this.getAttribute ("horizontalMode");
 
         this.addEventListener ('mousedown', this.startDrag);
-        this.addEventListener ('touchstart', this.handleTouch);
+        this.addEventListener ('touchstart', this.handleTouch, {passive:false});
         this.addEventListener ("dblclick", this.onReset);
     }
 
diff --git a/assets/example_patches/Pro54/gui/index.js b/assets/example_patches/Pro54/gui/index.js
index 8349b8a8..047ee5b4 100644
--- a/assets/example_patches/Pro54/gui/index.js
+++ b/assets/example_patches/Pro54/gui/index.js
@@ -69,7 +69,7 @@ class Pro54Button extends HTMLElement
     connectedCallback()
     {
         this.addEventListener ('mousedown', this.buttonPress);
-        this.addEventListener ('touchstart', this.buttonPress);
+        this.addEventListener ('touchstart', this.buttonPress, {passive:false});
     }
 
     setPatchConnection (patchConnection)
@@ -593,7 +593,7 @@ class Pro54PatchView extends HTMLElement
         });
 
         this.shadowRoot.addEventListener ("contextmenu", (event) => event.preventDefault());
-        this.shadowRoot.addEventListener ('touchstart',  (event) => event.preventDefault());
+        this.shadowRoot.addEventListener ('touchstart',  (event) => event.preventDefault(), {passive:false});
 
         this.keyboardElement  = this.shadowRoot.getElementById ("Keyboard");
         this.modWheelElement  = this.shadowRoot.getElementById ("ModWheel");
diff --git a/assets/example_patches/Replicant/cmaj_Replicant.js b/assets/example_patches/Replicant/cmaj_Replicant.js
index 03f92f10..ed2745aa 100644
--- a/assets/example_patches/Replicant/cmaj_Replicant.js
+++ b/assets/example_patches/Replicant/cmaj_Replicant.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'replicant.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/Replicant/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/Replicant/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/Replicant/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/Replicant/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/RingMod/cmaj_Ring_Mod_Demo.js b/assets/example_patches/RingMod/cmaj_Ring_Mod_Demo.js
index b58081d5..b7111429 100644
--- a/assets/example_patches/RingMod/cmaj_Ring_Mod_Demo.js
+++ b/assets/example_patches/RingMod/cmaj_Ring_Mod_Demo.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'RingMod.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/RingMod/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/RingMod/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/RingMod/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/RingMod/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/STunedBar6/cmaj_STunedBar6.js b/assets/example_patches/STunedBar6/cmaj_STunedBar6.js
index 02063275..fa01ecfe 100644
--- a/assets/example_patches/STunedBar6/cmaj_STunedBar6.js
+++ b/assets/example_patches/STunedBar6/cmaj_STunedBar6.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'STunedBar6.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/STunedBar6/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/STunedBar6/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/STunedBar6/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/STunedBar6/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/SubtractOne/cmaj_SubtractOne.js b/assets/example_patches/SubtractOne/cmaj_SubtractOne.js
index fb08b521..dc19323b 100644
--- a/assets/example_patches/SubtractOne/cmaj_SubtractOne.js
+++ b/assets/example_patches/SubtractOne/cmaj_SubtractOne.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'SubtractOne.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/SubtractOne/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/SubtractOne/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/SubtractOne/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/SubtractOne/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/Tremolo/cmaj_Tremolo.js b/assets/example_patches/Tremolo/cmaj_Tremolo.js
index e57eaca1..be65a637 100644
--- a/assets/example_patches/Tremolo/cmaj_Tremolo.js
+++ b/assets/example_patches/Tremolo/cmaj_Tremolo.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'Tremolo.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/Tremolo/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/Tremolo/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/Tremolo/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/Tremolo/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/assets/example_patches/ZitaReverb/cmaj_Zita_Reverb.js b/assets/example_patches/ZitaReverb/cmaj_Zita_Reverb.js
index 5cba238c..3fd03edf 100644
--- a/assets/example_patches/ZitaReverb/cmaj_Zita_Reverb.js
+++ b/assets/example_patches/ZitaReverb/cmaj_Zita_Reverb.js
@@ -3,7 +3,7 @@
 //  This file contains a Javascript/Webassembly/WebAudio export of the Cmajor
 //  patch 'ZitaReverb.cmajorpatch'.
 //
-//  This file was auto-generated by the Cmajor toolkit v1.0.2648
+//  This file was auto-generated by the Cmajor toolkit v1.0.2651
 //
 //  To use it, import this module into your HTML/Javascript code and call
 //  `createAudioWorkletNodePatchConnection()`. The AudioWorkletPatchConnection
diff --git a/assets/example_patches/ZitaReverb/cmaj_api/cmaj-piano-keyboard.js b/assets/example_patches/ZitaReverb/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/assets/example_patches/ZitaReverb/cmaj_api/cmaj-piano-keyboard.js
+++ b/assets/example_patches/ZitaReverb/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }
diff --git a/cmaj_api/cmaj-compiler-wasm.wasm b/cmaj_api/cmaj-compiler-wasm.wasm
index 899a0c2b..5a51139e 100755
Binary files a/cmaj_api/cmaj-compiler-wasm.wasm and b/cmaj_api/cmaj-compiler-wasm.wasm differ
diff --git a/cmaj_api/cmaj-piano-keyboard.js b/cmaj_api/cmaj-piano-keyboard.js
index e4084071..9fc222e3 100644
--- a/cmaj_api/cmaj-piano-keyboard.js
+++ b/cmaj_api/cmaj-piano-keyboard.js
@@ -78,7 +78,7 @@ export default class PianoKeyboard extends HTMLElement
 
         for (let child of this.root.children)
         {
-            child.addEventListener ("touchstart", (event) => this.touchStart (event) );
+            child.addEventListener ("touchstart", (event) => this.touchStart (event), {passive:false} );
             child.addEventListener ("touchend",   (event) => this.touchEnd (event) );
         }
     }