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Chorus

Chorus is a modulation effect used to add thickness and often audible pitch modulation to a signal. The name is derived from the fact that a chorus of four singers, no matter how skilled and prepared, cannot sing the same part in exactly the same way and at exactly the same pitch. A chorus effect takes the signal, splits off a very short delay line, pitch modulates the delayed signal (or signals, in a stereo chorus), and then mixes the delayed signal with the original. The modulation is from a low-frequency oscillator, or LFO. Like a lot of modulation effects, chorus sounds show up in many places, from very inexpensive stomp boxes, to vintage analog devices, to high-end digital multi-effects hardware boxes.

Chorus can provide a lot of sonic effects. As an insert effect, it can thicken sounds by adding a subtle doubling effect, like two players playing the same part. Because it pitch modulates the delays, it can also offer a good way to add stereo ambience to a mono signal. To do this, chorus needs to be used as a send effect, because applying an insert effect to a mono channel produces only mono output. The following example uses chorus as a send effect.


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