Adding a specific sound layer?

I have two sound clips I want to add into the background of my existing movie.

The first clip is a short fade-in that should only play once; the second clip should begin right where the first one stops and loop.

Any advice on how I could do this?

make that sound play once on a level.

At the end of that put a frame action, and tell it to unload that sound and play the other one.
If you dnt get me, ill mock you one up!!

Let me know!

=)

(well thats one way)