Effect Type: Octaver · Bass Octave Pedal with Adjustable Midrange · True Bypass · 2 x independent octaves · Midrange Boost · The dual-voice M288 Bass Octave Deluxe's Dry knob mixes your direct bass signal with the octave effect and add up to 15dB of midrange punch. Aside from the Dry control, there are two additional knobs: Growl and Girth, which add midrange or low end to the M288 Bass Deluxe's sound. Use the Dry knob to mix your direct bass signal with the octave effect, or uae the Mid+ switch to add up to +14dB of internally adjustable low-mid punch at 400Hz or midrange pop at 850Hz. Two 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 features a durable, lightweight aluminum casting and has the same high-quality jacks and switches that make MXR pedals the road-ready standard. The MXR CHT circuit produces 18-volts of headroom from a single 9-volt battery or external power source. CHT utilizes voltage step-up techniques, which supplies constant 18-volt headroom regardless of source voltage. For example, CHT will produce 18-volt headroom from a used battery down to 4.5-volts and voltages up to 30-volts. CHT also protects against incorrect reverse polarity and AC voltages