Principles of Chorus

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Peter 6Sep12:
  • Material heres is transferred directly from the old pages in the Manual (now deleted).
  • The page title is purely a working-title. I welcome suggestions for a revised title prior to publication.

Bill 10Sep12: My understanding is that some (many?) chorus effect also apply a tiny pitch shift to the delayed/modulated signal as well.

A chorus is a Delay for which the delay time is modulated by a Low Frequency Oscillator (LFO). The most used LFO waveforms are sine and triangle.

Most modern chorus effect unit, be they plug-ins or hardware based, also spread the effect signal across the stereo field. Sometimes a parameter to control the depth and other behaviors may be encountered.

Some chorus effect also apply a tiny pitch shift to the delayed/modulated signal as well.

The effect can produce interesting sounds, one of which is to produce the illusion of more than one instance of the instrument/vocalist being present. What you get out of this effect, largely depends on your desire to experiment.


Play with the parameters one at a time and experiment.


Diagram of the Chorus Effect

Common parameters of a Chorus

Parameter Range : 0.0 to xxx.xx milliseconds

This is your normal delay parameter.


Parameter Range : 0-100% or sometimes in milliseconds

This determines the maximum amount of modulation applied to the delay time.


Parameter Range : 0 - 20 Hz (frequency)

Also sometimes referred to as the LFO frequency. Higher frequencies produce extreme effects.