         range: 0.0 ... 1.0,
         unit: .generic,
         flags: .default)
+    let filterRange = 20.0...20000.0
+    let filterTaper = 3.3
     let filterControl = AUParameter(
         identifier: "filterFreq",
         name: "Filter Cutoff",
         address: 1,
-        range: 10.0 ... 20000.0,
+        range: 0...1.0,
         unit: .generic,
         flags: .default)
 

                return AUValue(self.volume.gain)
            }
            if param == self.filterControl {
                return AUValue(self.filter.cutoffFrequency)
            }
            // if param == other values here...
            return 0

        createParameterSetters()
        createParameterGetters()
        createParameterDisplays()
        setDefaultAuValues()
    }

    func setDefaultAuValues() {
        volumeControl.value = 0.666
        filterControl.value = 1.0
    }

    private func createParameterSetters() {
