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With iOS native interface it possible to set a different rendering callback to each of a AudioUnit input bus. With Xamarin the callback seems to be set at the AudioUnit level. This prevent for example from having several different synthesizing method at the entry of a mixer.
A possible workaround is to combine the different callbacks together and switch inside depending on the bus index. But this solution is neither elegant nor efficient.
The fact that the SetRenderCallback is an instance method of AudioUnit does not mean it's global. You can/need still configure it via AudioUnitScopeType. Am I missing something here?
Created attachment 4767 [details]
Sample for the problem
Thank you for the comment.
I added you a sample to the problem. The sample is derived from the xamarin 'AUSoundTriggeredPlayingSoundMemoryBased' sample. The important part is in 'ExtAudioBufferPlayer.cs'.
The problem is that we cannot one different callbacks for each of the inputs bus of an multiChannelMixer unit.
Fixed in master