Jimi, worth the google. Was a Pink Floyd weapon of choice back in the day. A little antiquated by today's standards but was WAY ahead of it's time. The original looked like an ATM with foot controls. And built by a drum company!!! I've long sold my ARP Avatar but this is in that "holy crap...they could do THAT in the dark ages" vein.
The fact that it could be built into an enclosure this size is absolutely mind-blowing. I think the original had a bazillion diodes just to make it work.