URGENT: Preload a movie in an another one!

Hello, let me explain my problem briefly.
1- Main movie (index.swf) in 190KB size with a preloader.
2- Sound movie (Sound.swf) in 880kb in size. (A volume control bar and the music in different layers)
3- A placeholder for sound movie inside the main movie.

When page starts, the index.swf preloads and starts correctly, after that the movie begins. The thing I want ( and I can not do is) the sound bar
to preload in the preloader and then the control bar to become vissible while music starts.

you can both use loading the external swf to main movie or user another method.

Waiting for solutions urgently.

(Fla is 35MB in size, and I dont know why so I can upload here )