Programming a Light-Up Keyboard

[gnt]

Hi, I'm a software developer with an interest in music. I'm looking for a keyboard with light-up keys which I can control via external signals - ie: to adjust the lighting in real-time (not a pre-programmed file) in response to external input.

I gather this would be done through MIDI Sysex, which is highly manufacturer-specific and often poorly documented. I'm wondering what it would take to build something like this for, say, the Yamaha EZ-300 or some other keyboard with illuminating keys. I'm still in the exploratory stage and want to pick the best keyboard for this project - I don't currently own one.

Thanks for any help or suggestions about this!