             format: "%.0f",
             value: Double(transposition), minimum: -16, maximum: 16,
             color: AKColor.blue
-        ) { xpose in
-            transposition = Int(xpose)
+        ) { sliderValue in
+            transposition = Int(sliderValue)
             osc.reset()
         })
 

            format: "%0.3f s",
            value: osc.decayDuration, maximum: 2,
            color: AKColor.green
        ) { duration in
            osc.decayDuration = duration
        })

        addSubview(AKPropertySlider(

            format: "%0.3f s",
            value: osc.sustainLevel, maximum: 2,
            color: AKColor.green
        ) { sliderValue in
            osc.sustainLevel = sliderValue
        })

        addSubview(AKPropertySlider(
