Question about re-wiring handheld toy

[Weremountain]

Anyone know how/where to find out how to change or remap the different tones Lights Out (from Tiger Games) makes? I want to make it into a small keyboard to use when my band plays shows, but I have knowledge of electronics hardware. I'm not even sure if it's possible, but I have check around at a ton of sites (which ended in me playing the game for 3 hours) but I couldn't find anything.

Someday I'll be a toy designer and not have to hack other things into pieces to make what I like :-0

-jd