     /// - parameter aRef: Reference frequency of A Note (Default: 440Hz)
     ///
     public func frequencyToMIDINote(_ aRef: Double = 440.0) -> Double {
-        return 69 + 12*log2(self/aRef)
+        return 69 + 12 * log2(self/aRef)
     }
 }
 

    /// - parameter aRef: Reference frequency of A Note (Default: 440Hz)
    ///
    public func frequencyToMIDINote(_ aRef: Double = 440.0) -> Double {
        return 69 + 12*log2(Double(self)/aRef)
    }
}


    }
}

internal func AudioUnitGetParameter(_ unit: AudioUnit, param: AudioUnitParameterID) -> Double {
    var val: AudioUnitParameterValue = 0
    AudioUnitGetParameter(unit, param, kAudioUnitScope_Global, 0, &val)
    return Double(val)
}

internal func AudioUnitSetParameter(_ unit: AudioUnit, param: AudioUnitParameterID, to value: Double) {
    AudioUnitSetParameter(unit, param, kAudioUnitScope_Global, 0, AudioUnitParameterValue(value), 0)
}

internal struct AUWrapper {
    let au: AudioUnit

    init(au: AudioUnit) {
        self.au = au
    }

    subscript (param: AudioUnitParameterID) -> Double {
        get {
            return AudioUnitGetParameter(au, param: param)
        }
        set {
            AudioUnitSetParameter(au, param: param, to: newValue)
        }
    }
}


