[AudioToolbox] Some AudioToolbox APIs not yet implemented in Xcode13 #12489
Description
As part of Xcode 13.0 updates, the MIDIEventList struct needs to be implemented as part of CoreMidi framework updates. Until then, the AUMidiEventList struct cannot be implemented as part of AudioToolbox - and until both of these structs are implemented, the following properties must also wait:
ScheduleMidiEventListBlockMidiOutputEventListBlockAudioUnitMidiProtocolHostMIDIProtocolMusicDeviceMIDIEventList