IAA MIDI in Swift

// in ViewDidLoad in ParentViewController.Swift

// IAA MIDI var callbackStruct = AudioOutputUnitMIDICallbacks( userData: nil, MIDIEventProc: { (first, status, data1, data2, offset) in AudioKit.midi.sendMessage([MIDIByte(status), MIDIByte(data1), MIDIByte(data2)])}, MIDISysExProc: { (firstPointer, secondPinter, anotherInt32) in print("Not handling sysex")} )

    let connectIAAMDI = AudioUnitSetProperty(AudioKit.engine.outputNode.audioUnit!,
                                             kAudioOutputUnitProperty_MIDICallbacks,
                                             kAudioUnitScope_Global,
                                             0,
                                             &callbackStruct,
                                             UInt32(MemoryLayout<AudioOutputUnitMIDICallbacks>.size))
    if connectIAAMDI != 0 {
        AKLog("Something bad happened")
    }
    
    // Setup AudioBus MIDI Input
    setupAudioBusInput()
    startObservingInterAppAudioConnections()