By 在AS3中，NetStream类有这样一个属性：soundTransform，可以用来控制FLV的声音，其实现为：
实现
public function get soundTransform():SoundTransform
public function set soundTransform(value:SoundTransform):void
SoundTransform类又有个volume属性，于是想是不是直接这样写就行了：
var volumeSize:Number = 0.2;
ns.soundTransform.volume = volumeSize;
结果丫的没任何反应……莫非必须重新为ns指定一个soundTransform对象？于是改成这样：
var volumeSize:Number = 0.2;
var st:SoundTransform = new SoundTransform(volumeSize,0);
ns.soundTransform = st;
这样就木有问题了。
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寫的正好，感謝你