The BOSS TR-2 achieves a tremolo effect. RATE and DEPTH can be adjusted. I'm selling it because I'm switching out my effects pedals. It sounds great when you lightly apply tremolo to clean tone chord strumming. You can also use it as a special effect by applying it heavily to distorted guitar for a machine gun-like playing style. - Model: TR-2 - Type: Tremolo Effect Pedal - Control Knobs: RATE, DEPTH - Input/Output Terminals: INPUT, OUTPUT - Country of Manufacture: Malaysia Thank you for looking. Type... Electric Guitar Manufacturer... BOSS