This is a rare, discontinued first-generation "Brothers" pedal. I bought it a long time ago and once incorporated it into a tabletop board, but it was too feature-rich for me to fully utilize, so it's been sitting unused. It's a very good distortion effect pedal and I think it's rare, so I'm decluttering it for those who want it. ■ Guitar Effects Pedal ■ Boost, Drive, Fuzz ■ Controls ・MASTER: Adjusts the overall output volume. ・GAIN A: Adjusts the gain of channel A. ・TONE A: Adjusts the tone stack of channel A. ・GAIN B: Adjusts the gain of channel B. ・TONE B: Adjusts the tone stack of channel B. ・MIX/STACK: Usable when both A and B channels are ON. (Adjusts the parallel mix balance of channels A and B in PARA mode.) (Adjusts the volume balance of channels A and B in A >> B / B >> A modes.) ■ PARA / A >> B / B >> A switch: Sets the routing of channels A and B. (In PARA mode, it's a parallel mix; in A >> B mode, it's a series connection from channel A to channel B; in B >> A mode, it's a series connection from channel B to channel A.) ■ BOOST / DRIVE / FUZZ switch: Sets the effect type for each of channels A and B. (The circuit for channel A was developed in collaboration with Resonant Electronic, and the circuit for channel B is the original Chase Bliss Audio circuit.) ■ A, B footswitches: Switches ON/OFF for each channel. (DIP switch allows switching between momentary switch, relay circuit true bypass/buffered bypass.) ■ Preset selection switch: Recalls one preset each in the right and left positions, and manual settings in the center. Thank you for looking.