Sound equalizer

The sound eqalizer found on some pages. How is that done?? and is there a tut or a .fla out there that some one knows about. I would love to have something like that on my site. But I cannot seem to get one to got to the music like the ones I have seen do…


even though they look like they are going to the music. 99.99% of them are not. and if you watch them very closely and long enough you can see that there is a pattern on some, some don’t have a pattern because they are using random.