It seems the pointer event handling/shim isn't quite right, as mouse events are ignored and there are no pointer events delivered. This means that it's impossible to add any elements to the canvas. Altering setClickHandler to just put the handler on mousedown resolves not being able to add elements, but doesn't fix the rest of the input.
I don't know if this is an issue on other platforms/browsers, this is the only platform I have to hand to test it. I also can't add elements in IE11, but I don't know if that's just because web-audio is unsupported there or if it suffers from the same problem.
It seems the pointer event handling/shim isn't quite right, as mouse events are ignored and there are no pointer events delivered. This means that it's impossible to add any elements to the canvas. Altering setClickHandler to just put the handler on mousedown resolves not being able to add elements, but doesn't fix the rest of the input.
I don't know if this is an issue on other platforms/browsers, this is the only platform I have to hand to test it. I also can't add elements in IE11, but I don't know if that's just because web-audio is unsupported there or if it suffers from the same problem.