MCtween volumeTo fades all sound...but i don't want it to!

programming flash
1

WHY?

I’m fading out an audio clip “thunder” with some simple code, but ALL the sounds volume fade out…I just want what i tell it to fade out. Any thoughts on why this is happening?

thunder = new Sound();
thunder.attachSound(“thunder2”);
thunder.start(0,99);

and then…

thunder.volumeTo(0, .5, “linear”);