This is a clone of the VEMURAM Jan Ray. I purchased it on Yahoo Auctions seven years ago and used it for about 3-4 years, enjoying it. Due to a change in my playing style, I'm reluctantly selling it to organize my gear. The four white knobs are Volume, Drive, Low EQ, and High EQ. The black knob in the middle is the Presence knob, which significantly alters the overall tonal balance when turned up. It has the characteristics of a Jan Ray while also having a fairly unique character. I used to leave it on all the time. Thank you. - Type: Guitar Effect Pedal - Number of Knobs: 4 - Color: Silver - Connections: 1/4 inch jack Thank you for looking.