The EHX Octave Multiplexer Analog Sub-Octave Generator delivers deep, phat bass tones one octave below the notes you play. Two separate smoothing filters enable you to tailor your sub-octave signal to the exact bass sound you desire, separating the Octave Multiplexer from other octave devices. Run your vocals through it and sound just like Ike Turner. This is a monophonic device and works only on single notes. True bypass Create very smooth and natural bass tones one octave below your played note Sub-octave is switch-selectable Hi and low filter controls let you tailor the perfect bass tone Tough and compact die-cast chassis 9V battery included