let gNotePlayer = AKSampler()

    do{
        try gNotePlayer.loadWav("Support Objects/Grand Piano")
        print("G Player Ready")
    } catch{
        AKLog("File not found")
        return
    }

    let fNotePlayer = AKSampler()

    do{
        try fNotePlayer.loadWav("Support Objects/Grand Piano")
        print("F Player Ready")
    } catch{
        AKLog("File not found")
        return
    }

    let grandStaffMix = AKMixer(fNotePlayer, gNotePlayer)

    AudioKit.output = grandStaffMix
    do{
        try AudioKit.start()
    }catch let error as NSError{
        print(error.debugDescription)
    }

    var curBeat = 0

    if #available(iOS 10.0, *) {
        timer = Timer.scheduledTimer(withTimeInterval: 60 / tempo * 0.0625, repeats: true) {_ in

            if !gNotesMIDI.isEmpty && curBeat < gNotesMIDI.count {
                if let noteNumber = gNotesMIDI[curBeat] {
                    gNotePlayer.play(noteNumber: MIDINoteNumber(noteNumber))
                }
            }

            if !fNotesMIDI.isEmpty && curBeat < fNotesMIDI.count {
                if let noteNumber = fNotesMIDI[curBeat] {
                    fNotePlayer.play(noteNumber: MIDINoteNumber(noteNumber))
                }
            }

            curBeat += 1

            if curBeat > gNotesMIDI.count + 5 && curBeat > fNotesMIDI.count + 5 {
                self.stopPlaying()
                self.isPlaying = false
            }

            /*if Double(curBeat) > self.tempo * co {
                timer.invalidate()
            }*/
        }
    }