i got this at the salvation army, but a better one in la habra.
so,
if you have one of these, you know that it is LOUD.
the first thing i had to do was scrape some battery acid off the contacts. then,
i started bending it by adding some caps with switches for animal and train distortion, and bought some brass screws for body contacts. the one with the acorn nut is the ground. the screw to the left it animal pitch down, the one to the right is train pitch down. touch the 2 left screws for animal pitch up and touch the right 2 for train pitch up. simple. i'm gonna add an audio out soon, with some resistance to cool of the signal. this is an homage to q.r.g.s morpheum. i'm not gonna paint it. this thing is wacky enough as is.

gee that should REALLY help explain how it works.