The M288 is a two-tone octave pedal that offers "organic analog tone", true bypass and a variety of other possibilities to shape the tone.
Although the pedal is powered by 9 volts, you get studio-quality headroom and superior tracking with MXR's 18-Volt Constant Headroom Technology™ ( CHT ).
Use the Dry knob to mix the direct signal with the octave effect or turn on the Mid switch to boost "low-mid punch" ( 400 Hz) or "midrange pop" ( 850 Hz) up to +14dB (internally selectable and adjustable). In addition, there is a Growl knob for rumbling midrange in the octave or a Girth knob for deep and smooth octave tone.