   }
   
   @IBAction func changeBrightnessMin(sender: UISlider) {
-    let val = sender.value
+    setBrightnessMin(sender.value)
+  }
+  func setBrightnessMin(val: Float) {
     brightnessLabel.text = "\(val)"
     uart("b:\(val);")
   }

    let r = NSString(format: "%03d", Int(instrumentColor.getRed()))
    let g = NSString(format: "%03d", Int(instrumentColor.getGreen()))
    let b = NSString(format: "%03d", Int(instrumentColor.getBlue()))
    
    uart("i:\(r).\(g).\(b);")
  }
  func updateEffectColor() {

    setReverbWetDry(0)
    setReverbPresets(4)
    
    setBrightnessMin(0.15)
    
    mixer = AVAudioMixerNode()
    
    engine.attachNode(eq)
