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Updating Cocoa View of system-supplied Audio Units

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Updating Cocoa View of system-supplied Audio Units

Subject: Updating Cocoa View of system-supplied Audio Units
From: Ringo Frischmann <email@hidden>
Date: Tue, 10 Jan 2012 23:40:30 +0100

Hi,

I'm developing an application some hosts AudioUnits. In the GUI the user can select a factory preset and supply it to the AudioUnit via kAudioUnitProperty_PresentPreset. Third party AudioUnits like Native Instruments Guitar Rig reflects the changes in the Cocoa View immediately without further code. Unfortunately Apple system-supplied AudioUnits don't. I tried to implement a AudioUnitPropertyListenerProc and to call something like [view setNeedsDisplay:YES] in it, but this also doesn't work. Is there a (legal) way to update the Cocoa-GUI of these Units?

Thanks for reply.

Cheers
Ringo Frischmann
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