Duet is a double-tracking/harmonizer effect developed to enhance vocals or instruments, such as guitars, by thickening the sound and adding a rich glossy sheen to your audio material.

Duet works by independently pitch-shifting the left and right inputs using a novel synchronous overlap and add technique, allowing pitch to be manipulated in real-time while still maintaining the time duration of the audio. By also delaying the re-pitched audio and altering its pan position, Duet can accurately create the illusion of multiple voices and add a luscious texture to your music. Traditional modulation effects, such as flangers and phasers, modulate the signal’s time duration as well as pitch so can sound synthetic. By de-coupling pitch from time, Duet creates natural sounding results and can turn a single voice into a choir. Duet can also be used to create a silky chorus effect through modulation of pitch-shift amount or add movement and texture to synths.