nonInterleavedFloatStereoAudioDescription and AEAudioUnitChannel
TheEngineSample uses nonInterleaved16BitStereoAudioDescription in it's setup. If I change this to nonInterleavedFloatStereoAudioDescription, the AEAudioUnitChannel classes fail in the renderCallback (AudioUnitRender) with a code of -10876 (kAudioUnitErr_NoConnection)
Things appear fine, but I haven't dug too far into it yet. Other formats work, only the nonInterleavedFloatStereoAudioDescription seems to fail. Coincidently, the nonInterleavedFloatStereoAudioDescription is the only format I tried that causes the _converterNode to be skipped... which is suspicious, but I couldn't find anything immediately wrong with the non-coverted node.
Posting in hopes that this might trigger a clue.