I’ve been trying to set up AVAudioEngine to play back audio data from a 
third-party music playback library (libxmp: http://xmp.sourceforge.net 
<http://xmp.sourceforge.net/>) and have been getting this message when I try to 
connect the player node to the mixer node:

'xmpAVAudioEngineTest[90634:2069549] 16:16:41.772 ERROR:     
AVAudioNode.mm:521: AUSetFormat: error -10868’

What could cause this? I’ve looked on developer.apple.com and googled, but to 
no avail.

Also, is there any sample code in Objective-C available for using the new 
AVAudioEngine framework?
(Kapil at Apple said it is “coming soon” a while ago, but is there any ETA?)

Here is my code: 
https://gist.github.com/douglas-carmichael/ee38fc28e8ee9de63121 
<https://gist.github.com/douglas-carmichael/ee38fc28e8ee9de63121>

Thanks in advance!

—Douglas

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