I have experienced a "background" music issue also, a few days ago. Great posts gave me right advices, right there at WpW.
The fps for a music is a very "blur" idea. Music plays at the same speed, the right one, whatever is your fps. Let's take an example : if I use a "1 fps" rate, and the music lasts for 300 seconds, then the animation requires 300 images (frames) to reach the end of the music.
Now if I use a 12 fps frames rate, the same music will need 12 x 300 = 3.600 frames. This "frame" rate has nothing to deal with the speed at which the music is loaded, it's just a way to synchronise things.
Now, if you want to download an image BEFORE any music, and be sure it's downloaded before starting the music, then the best way to achieve it is to preload the image, using an ActionScript script to check the nb of downloaded frames, and then once the image is fully downloaded jump to the music.
Is it clear ? please ask if not.
JP
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