I've never used sounds in Flash, but perhaps you need to set up special movie clips which have a "Stop all sounds" action in one frame, and then in the next frame start the required sound.

Btw: What part of labels can't you get your head around?

<EMBED src="/cgi-bin/ubb/Members/sigs/00000302.swf" quality=high WIDTH=400 HEIGHT=80 TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"> </EMBED>