Electro Harmonix Deluxe Bass Big Muff Pi, bass guitar stomp box, distortion/fuzz, controls for: volume, tone, sustain, blend, gate, crossover HPF, crossover LPF, minitoggle switch (input 0/-10 dB), crossover switch, bypass switch, XLR DI out, jack in/out, jack DI out, 9V DC power supply is needed (NOT included), battery operation possible