The Bass Octave Deluxe offers two independent analog sub-octave voices with a Dry control and a Mid+ switch to optimize the sound of your parallel clean signal. The Bass Octave Deluxe is a dual-voice octave pedal that offers analog tone, true bypass, and a variety of tonal options. MXR's 18 volt Constant Headroom Technology™ provides high headroom and superior tracking. Use the Dry knob to mix in your direct signal, and hit the Mid+ switch to add up to +14dB of internally adjustable mid frequencies (400Hz or 850Hz). Finally, mix in two separately controlled octave voices—Growl (for throaty tone) and Girth (for deep tone). This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included). Features Two independent sub-octave voices MID+ switch adds mid range boost Constant Headroom Technology™ for exceptional headroom and tracking Organic analog tone True bypass CONTROLS MID+ switch adds up to +14dB of internally adjustable midrange (blue LED indicates on) DRY knob controls volume of clean bass signal GROWL knob controls volume of throaty, midrange sub-octave voice GIRTH knob controls volume of deep and smooth sub-octave voice 5 FOOTSWITCH toggles effect on/ bypass (blue LED indicates on) Controls Specs Input Impedance 1 MΩ Output Impedance < 600 Ω Noise Floor* 85 dB Octave Bandpass -3 dB, 8 Hz to 46 Hz Control Range Dry -∞ to +2.5 dB Girth -∞ to +1 dB Growl -∞ to +6 dB MID+ Switch** Gain +4 dB to +14 dB Frequency 400 Hz or 850 Hz Bypass True Hardwire Current Draw 14 mA Power Supply 9 volts DC (not included)