i posted vids of all the LuminAudio modes here
http://forum.arcadecontrols.com/index.php?topic=73641.0and to answer your question .. i have GameEx (using headkaze's plugin) light the specific controls for each game in MAME using the original colors from the control panel... i.e. 1942 is 2 buttons lit red/white, just like the original arcade hardware. and then for each of the console emulators, I have a profile set up to match the original colors of the game pad for that console ... and a custom profile for visual pinball ... etc
full RGB lighting and LEDwiz's goes a LONG way as far as improving usability of your cab ... otherwise you have to be there to explain what each button does for every frikin thing on it ... regular people cant figure that stuff out its too much to ask, especially if you got some crazy console emu set up with 7-8-9 buttons.... anything past A2600, NES, sega master system, and genesis is just asking too much of anyone to figure out =) .. even SNES has 4 buttons + 2 shoulder buttons .. = 6 buttons to figure out. not to mention N64 with its 2 main, 4 'dpad' buttons, trigger, and l/r.