Flanging - Signal Processing Effects

An audio signal is copied to make two identical signals.
One is delayed and played with the original signal.
The effect sounds like a comb filter.
Parameters:

-Depth - Controls the modulation of the delayed signal.
-Delay - How much the copy differs from the original signal.
-Width - The width increases the length of the signal.
-Rate - This is the speed of the modulation.
-LFO - Low frequency oscillator creates a slow and gradual effect.
-Feedback - Takes the delayed signal and puts it back into the signal which is delayed again and again and again...

You would use a flanger for a guitar or similar.
This was mainly used in the 50's & 60's.

Chorus - Signal Processing Effect

A signal is copied multiple times and each copy is given a different variation of these parameters:

-Rate - This is the speed of the modulation
-Depth - How much the copy differs from the original signal
-Pre-delay - Time it takes for the signal to be modulated
-Feedback - Taking the output and putting it back into the dry signal and then it happens again and                             again and again... and again...

You would use this because it makes one instrument sound like a large number of instruments. It fills up the song.