The Maxon D&S OD-801 is an effects pedal that allows for distortion and level adjustment. - Brand: Maxon - Model: D&S OD-801 - Controls: Distortion, Level - Input Terminals: INPUT - Output Terminals: OUTPUT Thank you for viewing. I purchased this used about 25 years ago. I haven't used it in a long time and it's been stored in a cardboard box, so I'm selling it now. I briefly tested the sound, and it seems to be working fine. The level volume knob feels a little looser than the others, but it doesn't seem to affect the adjustment. Please consider this if you are interested. Since it's an old item, I'm offering it "no claims, no returns" except in the case of complete failure.