Making buttons know

I have a button that is actually a Movie Clip (so I can animate it). I want this button to play a sound. (But this isn’t a sound question.)

If I have a list of 20 sounds, and 20 instances of this button mc, how can I make it know which sound is being called for?

If it were a normal button, each instance would have its own load- or attach-movie command. But since they’re MC’s, the invisible button hit is always the same.

Is there a way to make it look to the MC’s instance name to get which sound to load?