Major Morgan - I used to have one of these when I was a kid. It makes some rather loud square-wave organ sounds, which can vary in tone by the amount of pressure on the touch-pad. It also does some weird things when it gets damp, but I don't plan on getting it wet any time soon.
As you can see, I now have two different models. The one with gold shoulder-pads and stripes has a cleaner sound, different circuit-design, and I've added an 1/8" output.