It's old and unwanted.
Look at the layout: open the top and you get diagrams on what the various modules are doing, and there's a second flip-up circuit board with more diagrams...I weep at the effort. But even Freecycle won't have it and it's too big and too-little used to justify the space it takes up. It's going to leave in lovingly disassembled pieces. I may save the spring reverb: plug those into an amp and they're Neubauten-style percussion instruments.