Sound information?

I wanted to make a visulisation based on sound, like a winamp plug in.

The only thing that even remotely looks like it uses sound information is the sound players on FlashKit. (although they might be faking it)

http://www.flashkit.com/soundfx/Ambience/more3.php

Is there any information that can be pulled from a currently playing sound in Flash to base a animation off ?