Playing external SWF sound

[Rancor]

I imported an SWF movie onto my stage and it plays an mp3. I also have a couple buttons in the imported movie, one to stop the sound and one to play the sound. The play sound, however does not work.

Frame 1:

tune = new Sound();

Frame 2:

tune.attachSound("comeFly");
stop();

and on the play button:

on (press) {
    tune.Start();
}

I've also tried _root.tune.Start(); as well as putting the first two frames together.