Sounds类 外部调用音乐示例有三个音乐sound/musicNum 可以控制声音大小

package 
{
	import flash.display.*;
	import flash.media.*;
	//import fl.controls.*;
	import fl.events.*;
	//import fl.controls.*;
	import flash.events.*;
	import flash.net.*;
	import flash.text.*;
	import flash.ui.*;

	public class Sounds extends Sprite
	{
		private var soundChannel:SoundChannel;
		private var _soundTransform:SoundTransform;
		private var volumeNum:Number;
		private var url:String;
		private var request:URLRequest;
		private var sound:Sound;
		//private var myLabel:Label;
		//private var thickness:Number = 1;
		//private var mySlider:Slider;
		private var flag:Boolean;
		private var count:int;
		private var randomNum:int;

		public function Sounds(randomNum:int)
		{
			this.randomNum=randomNum;
			volumeNum = 1;
			recursion();
			url = "sound/music" + randomNum + ".mp3";
			request = new URLRequest(url);
			sound = new Sound  ;
			sound.load(request);
			sound.addEventListener(Event.COMPLETE,completeHandler);

			/*myLabel= new Label();
			myLabel.autoSize = TextFieldAutoSize.LEFT;
			myLabel.text = "";
			myLabel.move(100, 30);
			addChild(myLabel);

			mySlider = new Slider();
			mySlider.snapInterval = 1;
			mySlider.minimum = 0;
			mySlider.maximum = 100;
			mySlider.value = 100;
			mySlider.addEventListener(SliderEvent.THUMB_DRAG, thumbDragHandler);
			mySlider.move(myLabel.x, myLabel.y + myLabel.height);
			addChild(mySlider);*/

			//this.addEventListener(KeyboardEvent.KEY_DOWN,onkeyDown);
		}

		public function onkeyDown():void
		{
			if (flag)
			{
				mute();
				recursion();
				url = "sound/music" + randomNum + ".mp3";
				trace(url);
				request = new URLRequest(url);
				sound = new Sound  ;
				sound.load(request);
				sound.addEventListener(Event.COMPLETE,completeHandler);
			}
		}
		
		public function mute():void
		{
			soundChannel.stop();
		}
		
		public function _play():void
		{
			soundChannel = sound.play();
		}

		private function recursion():void
		{
			randomNum = Math.round(Math.random() * 2 + 1);
			if (count != randomNum)
			{
				count = randomNum;
			}
			else
			{
				recursion();
			}
		}

		private function completeHandler(e:Event):void
		{
			sound.removeEventListener(Event.COMPLETE,completeHandler);
			flag = true;
			_play();
			_soundTransform = new SoundTransform(volumeNum,0);
			addEventListener(Event.ENTER_FRAME,enterFrameHandler);
		}

		private function enterFrameHandler(e:Event):void
		{
			soundChannel.soundTransform = _soundTransform;
		}

		/*private function thumbDragHandler(e:SliderEvent):void
		{
			myLabel.text = e.type + ": " + thickness;
			thickness = e.value;
			_soundTransform.volume = e.value / 100;
		}*/

	}

}