I've imported a mp3 file into the library and made an actionscript class, but i can't access is in a movieclip.
EDIT: I'm using Adobe AIR, because i want to compile it as an Android Application
set AS Linkage
for your sound (in library panel)
then paste this code in your movieClip (first keyframe)
var snd:Snd=new Snd();
snd.play();
hope it helps