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What is a Chorus ?
A chorus is a Delay for which the delay time is modulated by an LFO ( Low Frequency Oscillator). The most used LFO waveforms are sine and triangle.
Most modern chorus effect unit, be they plugins or hardware based, also spread the effect signal across the stereo field. Sometimes a parameter to control the depth and other behaviours may be encountered.
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.
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.