The script can be downloaded here
1. convert your audio to keyframes
2. select your video or precomp layer
3. execute the script
A null layer and a parameter called "Max Forward" are created at the top of the comp, this parameter controls the "speed"...
Nab - that's amazing.
The script works extremely well. It's a tad chaotic with loud music (aside from using Audition or Soundbooth to change the Bass, or Treble, etc before I turn the audio into keyframes, would I be able to alter the chaotic nature with a linear(value, _, _, _, _)) expression in there somewhere?), but it works fantastically well in most occasions, especially when there's a distinct beat and lots of silences.
Thanks a ton, and well done! If I ever use it in a music video (like I intend to), I'll credit you, and even send you some cash if I have a budget!