I got this pedal.I got it from guitar center in 1990. They were giving them away. It’s a ok pedal you can get some decent sounds out of it. It’s a weird pedal kinda hard to describe the sound. But it’s nothing like a BBE sonic stomp I think you would be disappointed. I don’t think it would b worth trying to build it. I have a bbe sonic maximizer rack mount and a Dbx spectral enhancer rack mount it doesn’t even come close to them.