                 if param == self.volumeControl {
                     return String(format: "%.3f", floatValue)
                 }
+                if param == self.filterControl {
+                    return String(format: "%.3f HZ", floatValue)
+                }
+                // if param == other values here...
             }
-            // if param == other values here...
             return String(format: "%.3f", value?.pointee ?? 0)
         }
     }


class Conductor {
    var osc = AKOscillatorBank(waveform: AKTable(.square))
    var volume = AKBooster()
    var parameterTree: AUParameterTree
    let volumeControl = AUParameter(

        name: "Volume",
        address: 0,
        range: 0.0 ... 1.0,
        unit: .generic,
        flags: .default)
    let filterControl = AUParameter(
        identifier: "filterFreq",
        name: "Filter Cutoff",
        address: 1,
        range: 10.0 ... 20000.0,
        unit: .generic,
        flags: .default)

