     private var audioPlayer: AKAudioPlayer!
     private var timePlayer: AKTimePitch!
     private var panner: AKPanner!
+    private var booster: AKBooster!
     
     @IBOutlet private var audioInputPlot: EZAudioPlot!
     

        pitch.tickMarkPosition = NSTickMarkPosition.below
        
        timePlayer = AKTimePitch(audioPlayer)
        panner = AKPanner(timePlayer)
        AudioKit.output = panner
        
        setupPlot()
    }

        case .play:
           if playState == .stop {
                AudioKit.start()
                // panner.start()
                booster.start()
                timePlayer.start()
                audioPlayer.start()
                audioPlotter.resetHistoryBuffers()
