For me it seems that the Click on object is not working
On the Capx if you click on MUTE it should change to unmute and disable sound.
It does not work
It does work on Double click ...
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I don't think this is a bug - the Button object is floating above the canvas and handles the click before the Mouse object gets it. You just need to swap the Mouse 'clicked on object' event for the Button object's 'On clicked' event.
Thanks that worked