             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",
            value: generatorBooster.gain, minimum: 0, maximum:4,
            color: AKColor.green
        ) {gain in
            generatorBooster.gain = gain
        })

        addSubview(AKPropertySlider(
            property: "FILTER Frequency Cutoff",
            value: filter.cutoffFrequency, minimum: 1, maximum: 12_000,
            color: AKColor.red
        ) { cutoffFrequency in
            filter.cutoffFrequency = cutoffFrequency
        })

        addSubview(AKPropertySlider(
            property: "FILTER Frequency Resonance",
            value: filter.resonance, minimum: 0, maximum: 4,
            color: AKColor.red
        ) { resonance in
            filter.resonance = resonance
        })

        addSubview(AKPropertySlider(

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

        addSubview(AKPropertySlider(
