Electro Harmonix Octave Multiplexer

The Electro-Harmonix OCTAVE MULTIPLEXER is the result of many years of engineering research. To get the best results from it please put aside an hour or two for practice in a quiet room…just you, your guitar and amp, and the OCTAVE MULTIPLEXER. The OCTAVE MULTIPLEXER produces a sub-octave note one octave below the note you play. With two filter controls and a SUB switch, the OCTAVE MULTIPLEXER allows you to shape the tone of the sub-octave from deep bass to fuzzy sub-octaves.