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.
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