coreaudio_sys::audio_unit::MusicDeviceStartNoteProc

type MusicDeviceStartNoteProc = Option<extern fn(_self: *mut c_void, inInstrument: MusicDeviceInstrumentID, inGroupID: MusicDeviceGroupID, outNoteInstanceID: *mut NoteInstanceID, inOffsetSampleFrame: UInt32, inParams: *const MusicDeviceNoteParams) -> OSStatus>;