The MXR M288 Bass Octave Deluxe is a dual-voice octave pedal using MXR's 18-volt Constant Headroom Technology (CHT) to provide studio-performance headroom and superior tracking. Use the Dry knob to mix your direct bass signal with the octave effect or hit the Mid+ switch to add up to +14dB of internally adjustable low-mid punch (400Hz) or midrange pop (850Hz). Bass players love the 2 separately processed and individually voiced octave controls Growl (for throaty midrange octave-below tone) and Girth (for deep and smooth octave below). The Bass Octave Deluxe boasts a durable lightweight aluminum casting and has the same high-quality jacks and switches that make MXR pedals the road-ready standard on pedal-boards around the world.