Is it possible to set up an AVAudioEngine and friends so I could feed it a sequence of MIDI notes and have it play that sequence, using an AVAudioSourceNode as the sound source? The AVAudioSourceNode is just using a render block to produce a sine wave of a given pitch. Apple doesn't seem to have any sample code for AVFoundation that I could find, and all the examples I see online are too simplified (load a midi file and sound bank file, play it).

I've gotten as far as loading a short midi file as a test, but get an error that there's no AU connected to the track, and I can't figure out how to make that happen. But ideally, I'd like to generate the midi on the fly and feed the notes into an AVAudioSequencer (I think).

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Steve Mills
Drummer, Mac geek