Octave pedal

A pedal that adds notes an octave above or below the played pitch, or sometimes both at once.

The classic analogue designs derive the sub-octave by dividing the input frequency, which produces a strong square-wave tone with a slightly synthetic, buzzing quality and imperfect tracking on chords. Digital versions track better and add intervals such as a fifth or two octaves down, and some generate a separate synth-like voice entirely. Used on a bass or a low-register guitar, the effect thickens a single-note line; used on a lead line, it can suggest an organ or a second instrument.

Example: an octave-down pedal on a guitar riff adds a low-register weight that sounds like a bass playing the same part.

Octave pedal

See also