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AUEventListener sending incorrect parameter changes?

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AUEventListener sending incorrect parameter changes?

Subject: AUEventListener sending incorrect parameter changes?
From: Michael Norris <email@hidden>
Date: Fri, 21 Mar 2008 14:22:36 +1300

Hi there

I've noticed some slightly odd behaviour with AUEventListenerCreate and the default UI for AudioUnits.

My code opens the AUBandpass window with the default UI (two sliders). I also set up parameter listeners on these two sliders using the following code:

CFRunLoopRef runLoop = (CFRunLoopRef)GetCFRunLoopFromEventLoop(GetCurrentEventLoop()); result = AUEventListenerCreate(MyPropertyListener, NULL, runLoop, kCFRunLoopCommonModes, .100, .100, &MyListener);

When I click and drag the first slider, I get parameter change notifications as expected.

However, if I then click on the second slider, WITHOUT moving the mouse, I get a parameter change for the value of the first parameter. Only when I move the mouse do I get the parameter changes for the second parameter.

I would appreciate it if someone could explain why this is happening, and/or how to work around it?

Thanks
Michael
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