A chorus effect occurs when individual sounds with roughly the same timbre and nearly (but never exactly) the same pitch converge and are perceived as one. While similar sounds coming from multiple sources can occur naturally (as in the case of a choir or string orchestra), it can also be simulated using an electronic effects unit or signal processing device. 

Chorus Controls 

Waveform 

Sets the waveform shape Sine or Triangle of the LFO. 

Dry/Wet mix 

Sets the ratio of wet (processed) signal to dry (unprocessed) signal. 

Depth 

Sets the percentage by which the delay time is modulated by the low-frequency oscillator, in hundredths of a percentage point. 

Feedback 

Sets the percentage of output signal to feed back into the effect's input. 

Frequency 

Sets the frequency of the LFO 

Delay 

Sets the number of milliseconds the input is delayed before it is played back. 

Phase 

Sets the phase differential between left and right LFO.