computeSpectrum (links to tutorials, etc)

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Hey there, i’m trying to learn the computeSpectrum method, and how to use it to create Music Player video effects that react to music. I’ve been going through a source code and trying to modify it where i can and here’s a glance at was done:

800×600: http://www.fastswf.com/QAaS_lQ
1280×720: http://www.fastswf.com/KbGYUic

[EDIT]: Here’s after 2 hours of messing around ;) http://www.fastswf.com/1ezz5vo
(Click on the screen to change the “sharpness” of the animation.)

Altho, i wanna do it from 0, my self, is this something hard to achieve on my own, or can i do it through tutorials, documentation and such? If so, i would like some links if you guys know a few good ones. Thanks ;)