i was browsing around for G15 plug-ins and found this cool one,cant beleive i never came across it before 
you can get it here:http://www.g15-applets.de/ray-s-winamp-plugin-t206.html
and heres the readme contents so you can get an idea of what it does before you get it,enjoy
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edit:forgot to mention,hold down both ctrl keys and scroll down to the bottom of the settings menu for the 2 options>One lets you pulsate all your keys with the backlight still on and the other turns off the backlight off until you hear a beat of music.

you can get it here:http://www.g15-applets.de/ray-s-winamp-plugin-t206.html
and heres the readme contents so you can get an idea of what it does before you get it,enjoy

edit:forgot to mention,hold down both ctrl keys and scroll down to the bottom of the settings menu for the 2 options>One lets you pulsate all your keys with the backlight still on and the other turns off the backlight off until you hear a beat of music.
1) Put gen_15_ray.dll in your winamp plugins folder.
2) Have fun
Softkey 1 (default)
Winamp spectrum
Winamp title
Winamp song length
Winamp Song duration
Winamp song position (progressbar)
Softkey 2 (playlist)
Use volume wheel to scroll through playlist.
press play key to play song.
Softkey 3 (Volume Control)
Hit softkey multiple times to get different mixers.
Use volume wheel to set volume.
Returns to Winamp screen after 2 seconds of inactiviy
Softkey 4 (configuration)
Use scrollwheel to scroll through options
Use Playkey to toggle the selected option.
--Ray