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// **********************************************************
// MARK: - AudioBus MIDI Input 
// **********************************************************

extension ParentViewController {
    
    func setupAudioBusInput() {
        midiInput = ABMIDIReceiverPort(name: "FM Player MIDI In", title: "FM Player MIDI In") { (port, midiPacketListPointer)  in
            
            let events = AKMIDIEvent.midiEventsFrom(packetListPointer: midiPacketListPointer)

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 // **********************************************************
    // MARK: - AudioBus Host Icon
    // **********************************************************
    
    private func startObservingInterAppAudioConnections() {
        audioUnitPropertyListener = AudioUnitPropertyListener { (audioUnit, property) in
            self.hostAppIcon.image = AudioOutputUnitGetHostIcon(AudioKit.engine.outputNode.audioUnit!, 44)
        }
        
        AudioKit.engine.outputNode.audioUnit!.add(listener: audioUnitPropertyListener, toProperty: kAudioUnitProperty_IsInterAppConnected)

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// 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