Sound on/off by click a button in flex4????

Question

hello everybody, i want to make a website by flex.in that have sound  effect. i want when i load page have sound and if i don't want to listen  i can click button.the sound will stop play and else. But i don't know  how to make on/off sound by a button click
i done:
in actionscript file                Sound_playExample1.as: i write code
package myComponents {
    import flash.display.Graphics;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.events.ProgressEvent;
    import flash.media.Sound;
    import flash.media.SoundChannel;
    import flash.net.URLRequest;
    public class Sound_playExample1 extends Sprite {
                private var snd:Sound = new Sound();
        private var channel:SoundChannel = new SoundChannel();
        public function Sound_playExample1() {           
            var req:URLRequest = new URLRequest("myComponents/soundall.mp3");
            snd.load(req);              
                channel = snd.play(0,6);   
// ActionScript file
in my Main.mxml:i write
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:MyComp="myComponents.*"
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
    <fx:Script>
        <![CDATA[
            protected function button1_clickHandler(event:MouseEvent):void
                // TODO Auto-generated method stub
        ]]>
    </fx:Script>
    <fx:Declarations>
         <MyComp:Sound_playExample1/>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>
    <s:Button x="177" y="71" label="Button" click="button1_clickHandler(event)"/>
</s:Application>
can u help me please what i have to do. if you know you can
Additional for this code.thanks

Answer 1

// below code sinppet should go into on button click event handle method.
if
(pausePosition==0 ){ if(channel!=null){pausePosition = channel.position;
channel.stop();
sound.setStyle("icon",soundOffClass);  // mute
}else{ 
if(channel!=null){channel.stop();
channel = snd.play(pausePosition);
sound.setStyle("icon",soundOnClass); // un mute , this should be default as
pausePosition=0;