How to connect AKSequencer to a AKCallbackInstrument?

Question

I want to read a midi file and display things when note events are triggered. I found this stackoverflow question, where the second answer suggests to use AudioKit : How Do

Answer 1

typewriter found the solution to my problem. Here is the code which works now, printing the midi number of the note each time it is played (but I didn't add sound yet) :

// dont write the .mid extension in filename :
let sequencer = AKSequencer(filename:"coucou") 
let callbackInstr = AKMIDICallbackInstrument()
callbackInstr.callback = myCallBack
sequencer.setGlobalMIDIOutput(callbackInstr.midiIn)
sequencer.play()

func myCallBack(a:UInt8, b:MIDINoteNumber, c:MIDIVelocity) -> () {
    if (a == 144) {  // if noteOn
        print(b)
    }
}