oh! I might as well comment on the OP. Unless you are playing live, I I wouldn't worry about pro-sound modding or even backlighting really. The backlight is great for being on a dark stage, but adds a slight hum to the mix, and the only reason for the pro-sound is to drop the output to line-level for when you are running it to a PA. If you plan on recording with it, standard unmodded output is just fine, and the little bit of extra bass you get from the prosound can be duplicated by... simply EQing the bass up a bit. In fact, you would be surprised at how many famous chiptune tracks were recorded with just stock gameboys. The mod culture thing is fun, but I feel like there is a bit of gear fetish to it. So if you enjoy working with solder and all that then go for it! but it is in no way required to make good sounding hardware chiptune.
oh! I should add that im being a bit hypocritical here, haha. I always record with prosounded backlit boys! I just don't want people to feel like they need expensive kit to get in the door. chiptune is cheap!
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