A chorus effect creates the sound of multiple sources producing the same, or very similar sound at the same, or similar time.
An example of a chorus effect is the sound of a choir singing; multiple voices in different pitches sung at very similar times. Chorus effects can produce a more ambient sound similar to flanger effects, but differ in the delay times used.
Chorus effects are produced by cloning the sound signal, slightly delaying the signals and also altering its pitch using low-frequency oscillation (LFO) while mixing it with the original sound signal. This creates a sound similar to two or more guitars playing together and thickens the guitar’s sound.
The Bucket-Brigade Device and the First Chorus Effects Pedals
Chorus effects pedals became available for electric guitar between 1975 and 1976 using what is known as a bucket-brigade device. The first chorus pedal to use the bucket-brigade device was the BOSS CE-1 Chorus Ensemble. The same circuit used in the BOSS CE-1 was the same circuit used in the legendary Roland Jazz Chorus guitar amp.
In 1979 the BOSS CE-2 was introduced and since has become one of the best selling chorus effects pedals ever after booming sales in the 1980s. The BOSS CE-2W is a Waza Craft reproduction of the original BOSS CE-2 with added options.
Chorus effects come in different forms and options from on-board effects on guitar amps, rack mountable units, and effects pedals.