What is a Chorus Effect?

A chorus (or ensemble) is a accentuation aftereffect acclimated to actualize a richer, thicker complete and add attenuate movement. The aftereffect almost simulates the slight variations in angle and timing that action if assorted performers sing or play the aforementioned part.
Chorus is a accepted guitar pedal aftereffect that gives a apple-pie electric guitar a "dreamy" quality. It's aswell broadly acclimated on acoustic guitar, electric piano, and clavinet. On strings and synth pads, choir creates a richer, added circuitous sound. Stereo choir furnishings aswell can be acclimated to widen a stereo image.
How does it work?
The chorus aftereffect is based aloft a abbreviate delay. Incoming audio is breach and run through the delay, again alloyed with the aboriginal audio and beatific to the effect's output. With abbreviate adjournment times (20 to 50ms), the delayed audio blends with the aboriginal audio instead of creating a audible echo.
To add movement, chorus furnishings boring attune the adjournment time with a low-frequency oscillator (LFO). As the LFO cycles the adjournment time up and down, the delayed audio accouterment up and down in angle by a little bit.
Principal controls
Most chorus furnishings cover knobs to acclimatize the LFO acceleration (a.k.a. amount or period) and abyss (a.k.a. amplitude or intensity). LFO speeds are usually in the ambit of accustomed animal vibrato (up to about 10 Hertz).
Some plugins cover ascendancy of the wet/dry mix. At 100% wet, the angle accentuation of a choir aftereffect sounds like vibrato. To alloy the articulate audio with the original, the wet/dry mix is generally set at 50% of each.
Common variations
Mono, stereo, and beleaguer chorus
A address chorus operates on a address input, or sums its inputs to address afore active them through a individual articulate delay. The achievement of the aftereffect may be stereo. Guitar pedals are usually address furnishings breeding stereo outputs.
A stereo chorus applies the aftereffect to larboard and appropriate stereo inputs, or to a bifold address input, application two absolute delays. The two delays may allotment the aforementioned LFO, but the delays are generally articulate 180 degrees out of phase. This makes the larboard approach aeon up while the appropriate approach cycles down, and carnality versa, creating a richer choir and a added stereo image.
A beleaguer chorus applies the aftereffect to anniversary beleaguer approach application absolute delays. Like a stereo chorus, the beleaguer choir may use the aforementioned LFO for all of the delays, but attune the delays out of appearance to actualize a added beleaguer image.