I purchased this new for my guitar rig for some big $ in the 1980s. I can t pin down the actual year but it was when I was performing in full goth makeup, so had to be 82-ish. It s really painful to let this thing go after all those years. It works to utter perfection. I just opened it up to check the batt; 3.28v. I m not selling this cheap. Maybe I don t want to sell it at all? The MIDI implementation of this would shame many modern multi units and my rig was heavily dependent on MIDI, both for presets and live parameter changes. Unusual even today is its ability to map multiple parameter changes, each with their own range and direction, to follow a single CC from your controller. Some musician design roots for sure at ART.I had to look to find a blemish on this. As it never, ever left my rack, there really aren t any.