you can loop an audio clip with actionscript if you have an audio clip in your library with a linkage id set.
say, for example, you have an audio clip in your library with a linkage id of sound_1. you can loop that with a bare function like so:
//initate the sound object
sound_1= new Sound();
//attach the "sound_1" clip from your library to the newly made sound_1 object
sound_1.attachSound("sound_1");
//play the sound
sound_1.start();
assign an onSoundComplete function that will play the sound again after it has finished.
sound_1.onSoundComplete= function(){
sound_1.start();
};
there are several other ways to go about it, but this is just one. its not as confusing as some other methods, and works fine.