Hi
I don´t know any automatic way. I think that you must go in a frame-by-frame basis, modifying each frame content.
However, there’s a tool that may help you, a tool used to sync image animations to audio:
1. Bring the audio to the comp
2. Select it
3. Animation – Keyframe Assistant – Convert Audio to Keyframes
Good luck.
“Experience alone does not create knowledge.” Kurt Lewin