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

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

    
    
    @IBAction func changePan(_ sender: NSPopUpButton) {
        // panner.pan = Double(sender.selectedTag())
        
        switch sender.selectedTag() {
        case 1: // left
            booster.leftGain = 1.0
            booster.rightGain = 0.0
            
        case -1: // right
            booster.leftGain = 0.0
            booster.rightGain = 1.0
            
        default: // stereo
            booster.leftGain = 1.0
            booster.rightGain = 1.0
        }
    }

    @IBAction func positionSlider(_ sender: NSSlider) {
