There are many ways to control lighting using your computer. You won't end up with that ricey "pulsing" effect that sucks. Winamp has a lot of plugins (if you use mediaengine or roadrunner) that work with DJ lighting systems, as well as a few simpler ones that flash your keyboard lights (caps lock etc) to the music. Its just a little soldering and boom you have a lighting control that will run 3 lights arrays.
Here is the link to the the keyboard controller..
http://www.winamp.com/plugins/details/58104
Another link for a killer winamp light cube controller
http://www.google.com/search?hl=en&q...ization+winamp