             
         case .stop:
             AudioKit.stop()
-            panner.stop()
+            // panner.stop()
+            booster.stop()
             timePlayer.stop()
             audioPlayer.stop()
             NSLog("stop play")

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

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