     ///
     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 {

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

    ///
    public func setLoopInfo(duration: AKDuration, numberOfLoops: Int) {
        if isAVSequencer {
            print("AKSequencer ERROR ! setLoopInfo only work if not isAVSequencer ")

            //nothing yet
        } else {
