     ///
     public func clearRange(start start: AKDuration, duration: AKDuration) {
         if isAVSequencer {
-            print("AVSequencer ERROR ! clearRange only work if not isAVSequencer ")
+            print("AKSequencer ERROR ! clearRange only work if not isAVSequencer ")
         return }
 
         for track in tracks {

    ///
    public func addTempoEventAt(tempo bpm: Double, position: AKDuration) {
        if isAVSequencer {
            print("AVSequencer ERROR ! addTempoEventAt only work if not isAVSequencer ")
            return }

        let constrainedTempo = min(max(bpm, 10.0), 280.0)

            if isAVSequencer {
                avSequencer.rate = Float(newValue!)
            } else {
                print("AKSequencer ERROR ! rate only work if isAVSequencer ")
            }
        }
    }
