*sigh*
That solution won't work. Have you EVER used Flash before? To begin with the option is called, "stream", meaning that the sound is streamed across the soundboard progressively as the movie is rendered. Second, when you change the Frames Per Second the audio in the movie automatically extends to fit the new framerate, meaning it'll go out of sync anyway.
Third, by definition you can't sync sound to frames that have had their frame rate shifted up. Not without re-adjusting the frames so they'd play in the new FPS correctly. Lets say that there's a beat halfway through a song, and you tap your foot on the beat. Now, take the video and play it in fast forward, but keep the audio the same. What happens? You tap your foot a quarter of a way into the song, not halfway. The only "easy" way to get it back in sync is to stick a duplicate frame in after every single frame of the animation. But that would be exactly the same thing as just having it on half the current FPS, so there's absolutely no point. To have the audio sync with the newer, faster, video, you'd have to double the speed of the audio too, and anyone with any experience in sound engineering knows exactly what that does.
If you want to animate at ___ FPS then figure that out at the start, or figure out how to code in actionscript 3.0 and pray nobody notices the audio desyncing.
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