进度条走到头发出声音

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
        layout="vertical" 
        verticalAlign="middle" 
        backgroundColor="white"> 
  
    <mx:Script> 
        <![CDATA[ 
            import mx.events.SliderEvent; 
  
            private function slider_change(evt:SliderEvent):void { 
                progressBar.setProgress(evt.value, slider.maximum); 
            } 
        ]]> 
    </mx:Script> 
  
    <mx:SoundEffect id="ding" 
            source="@Embed('ding.mp3')" />  
  
    <mx:ApplicationControlBar dock="true"> 
        <mx:Form styleName="plain"> 
            <mx:FormItem label="percentComplete:"> 
                <mx:HSlider id="slider" 
                        minimum="0" 
                        maximum="100" 
                        value="0" 
                        snapInterval="1" 
                        tickInterval="10" 
                        liveDragging="true" 
                        showTrackHighlight="true" 
                        change="slider_change(event);" /> 
            </mx:FormItem> 
        </mx:Form> 
    </mx:ApplicationControlBar> 
  
    <mx:ProgressBar id="progressBar" 
            mode="manual" 
            completeEffect="{ding}" /> 
  
</mx:Application>