Simple AU Host for MIDI Processor

ndnr

I work on a sequencer and would like to create a standalone app. I work with the Apples default example for a MIDI Processor (you can create this when you do a new Xcode project for a MIDI Processor). Unfortunately the MIDI messages from the AUv3 extension do not reach my host app. It works properly in logic, so i assume the problem is my host.

I tried something to add something like this to the example to send MIDI:

    private let auAudioUnit.midiOutputEventBlock = { sampleTime, cable, length, data in
                guard length > 0 else { return noErr }
                let bytes = Array(UnsafeBufferPointer(start: data, count: Int(length)))
                print("[MIDI 1.0 OUTPUT] \(bytes)")

                Task { @MainActor in
                    MIDIManager.shared.sendMIDIData(bytes)
                }
                return noErr
    }

and

private let midiOutputEventListBlock: AUMIDIEventListBlock = { sampleTime, cable, eventList in
     [......]
        return noErr
}

Both approaches don't work so far. I am wondering if someone has a simple example or knows how to do this (ideally with MIDI 2.0).