Sound question re: how to stop before another plays

Hi again. One more beginner's question:
I created a movieclip so that viewers may choose among looping tracks to play in the background. I haven't yet figured out how to use labels, etc, so I simply attached each loop to the "down" frame of it's corresponding button.
What I want to do though is have the button switch off all sounds, then play its loop, so two or more looping sounds aren't going at once. When I use the "stop all sounds" action command in either the button, or the instance of the button (in the movie clip), it never lets its own sound play.
Is there a simple way to make the "stop all sounds" command come before it starts looping its sound? Or is this not so simple or am I approaching it all incorrectly? Thanks again!!