Quoted from FlippyD:I'm guessing it's just some real thin LEDs and different parts of the art screened out to let the light through but maybe it's M A G I C !
It's not exactly rocket science....
It's a thin film print with masking, over the top of EL paper with the control box firing up specific sections...hell, the control box is honestly the most "complicated" part of the whole thing to me. Love the VU meter one I have in metallica, but it was super tight in my game and unfortunately any time I move the PF it's at extreme risk of getting damaged. Just wasn't very much clearance on my specific game.