This is a monophonic device and works only on single notes. Quick Specs 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 Dimensions in inches: 4.0 (w) x 4.75 (l) x 2.25 (h) Dimensions in mm: 102 (w) x 121 (l) x 89 (h). The item "EHX Electro-Harmonix Octave Multiplexer Guitar Effects Pedal" is in sale since Friday, September 21, 2018. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Other Guitar Effects Pedals". The seller is "msm_dj" and is located in New Westminister, BC.This item can be shipped worldwide.