ActionScript 3.0 :: Changing FPS Of Embeded MC?

I have read all sorts of answers all over the internet on this subject, but I can't get anything to work, even with AS3. I've read all over the place how changing an individual movie clip's fps can be done dynamically separate from the main fps of the movie using AS3, which is what I'm using, but it still doesn't work for me.

Can it be done or not?  My movie has 2 different scenes.  In Scene 1, I have to embedded clips that I would like to move at 25 fps but the rest of the movie can I want to still run at 12.  I get all kinds of error messages when I try to script an fps change and the movie plays the errors.I have even tried to raise the overall fps of the entire movie and then slow each element down to where I want it, but that doesn't work either. (I read somewhere that you can script for less fps, but not more, so I tried that, too, and it didn't work).  Is it possible to script 2 different sets of main stage fps for the two different scenes?

If I can't get it to run with these 2 embeded clips faster than the rest of the movie, would it just be better to make the whole thing into 2 separate movies and run them back to back (or would that be too much hassle for a user/server)?