Apple

I think you found the origin of the probelm. I tried with MAX_TRACKS = 1 and it sounds fine.

I am indeed setting the render callback on multiple channels of the mixer. Based on the inBusNumber, I read a different audio data (contains in an array[MAX_TRACKS+1]).

What I now don’t get is that why my mixer does not properly “mix” multiple channels. Like it used to with xcode5. Has some settings changed with xcode5?

Pascal

Are you setting the render callback on multiple channels of the mixer? If so, you should be using different data structures for each sine wave generator. Otherwise the render callback will be called MAX_TRACKS + 1 times per cycle and that could be distorting your wave. I would normally assume that you would only set the callback once on one channel of the mixer.