     let drumPlayer = AKClipPlayer()
     let guitarPlayer = AKClipPlayer()
     let mixer = AKMixer()
-    var drumLooper: AKAudioPlayer?
+    var drumLooper: AKPlayer?
     let playButton = AKButton()
     let guitarDelay = AVAudioUnitDelay()
     let reverb = AKReverb()

        guitarPlayer.volume = 0.6
        guitarLooper.volume = 0.3
        drumPlayer.volume = 0.6

        AudioKit.output = mixer
        AudioKit.start()

                drumPlayer.stop()
                guitarPlayer.stop()
                guitarLooper.stop()
                ambientGuitar.stop()
                drumLooper.stop()
                button.title = drumPlayer.isPlaying ? "Stop" : "Play"

