This dual-voice bass octave pedal from MXR Bass Innovations offers the sound, functionality and tone-shaping options that you've been craving for your bass rig. Compact, lightweight and easily powered by a single 9-volt battery, the M288 Bass Octave pedal utilizes MXR's own 18-volt Constant Headroom Technology (CHT) that provides the kind of studio-performance headroom and superior tracking you've only dreamed about until now.