The BOSS Bass Synthesizer SYB-3 is a bass effects pedal that offers a wide variety of sounds with its four knobs. I used it twice live. I haven't used it since then and have been storing it. - Model Name: Bass Synthesizer SYB-3 - Brand: BOSS - Output Terminals: OUTPUT A (MONO) - Input Terminals: INPUT - Number of Knobs: 4 - Pedal Type: Effects Pedal Thank you for looking.