         playAudioWithRate(2)
     }
     
-    func playAudioWithRate(rate: Float){
-        stopAudioPlaying()
-        audioPlayer.rate = rate
-        audioPlayer.play()
-    }
     
     @IBAction func playChipmunkAudio(sender: UIButton) {
         playAudioWithVariablePitch(1000)

        stopAudioPlaying()
    }
    
    func stopAudioPlaying(){
        
        audioEngine.stop()
        audioEngine.reset()
        
        audioPlayer.stop()
        audioPlayer.currentTime = 0
    }
    
    @IBAction func playSlowAudio(sender: UIButton) {
        // MARK: play audio slow


    }
    
    @IBAction func stopPlayAudio(sender: UIButton) {
        // MARK: stop play audio
        stopAudioPlaying()
    }
    
    
    func playAudioWithRate(rate: Float){
        stopAudioPlaying()
        audioPlayer.rate = rate
        audioPlayer.play()
    }
    
    func stopAudioPlaying(){
        
        audioEngine.stop()
        audioEngine.reset()
        
        audioPlayer.stop()
        audioPlayer.currentTime = 0
    }
    
    

}

