Originally Posted by sixstringmoneymachine

I don't know of a way to separate the visual from the audio in Flash itself.

Your second question about the frames doesn't make sense to me. The movie isn't editable on the timeline other than cutting it short by having fewer frames than actually required to show the full movie in Flash. And if you had more frames than neccessary without an empty keyframe at the end of the actual movie then you will get some anomolies in your playback.