Looping sound fading in and out based on frames?

Hello there!

I have a pretty long movie clip that contains some animation and whatnot. I also have a looping sound. I have an image fading in at the beginning over 15 frames. I have an image fading out at the end over 15 frames (for simplicity, let’s say ending at 100).

What I’m trying to do is have the loop fade in from frame 1-15 along with the image, loop throughout the movie, and fade out from frame 85-100 along with the image.

I’ve found how to fade music based on users scrubbing a slider, how to fade the beginning and the end of the loop itself, how to fade sound with javascript based on users clicking links, but nothing like what I’m trying to do.

Can someone point this Flash neophyte in the right direction? I’m afraid it’s one of those things that seems like it should be simple – it would be a snap if this were a Premiere project – but will actually be mind-bogglingly complex.