Flash stop all sound

Hello-
I'm working on a Flash document and am using sound for the first time.
I'm trying to add graphics to the dialog I imported. The problem is, when I play the Flash doc to see if the pictures are synching to the sound, and stop it, the sound continues playing. This is while I'm in Flash. Not a published SWF.
Is there a way to stop sound when I stop playing it?

I want to basically scrub the movie while I'm moving the graphics into the right timing. Thanks.

Brian