Electro Harmonix XO Octave Multiplexer

Analog Sub-Octave Generator

Get down! Generates 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
9-volt battery included