Arturia KORG MS-20 V User Manual page 106

MONO/STEREO chooses whether or not the delay voices are output on the far left
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and right sides of the stereo field.
VOICES chooses whether the dry signal is followed by one, two, or three delayed
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copies. This is an important setting, because the overall power of the chorus
effect needs to be adjusted to the preset and the song. Sometimes one voice is all
you need for a tiny bit of thickening or vibrato, but three voices is overwhelming.
(Of course, getting overwhelmed can be fun, too.)
101 Arturia - User Manual KORG MS-20 V - The Effects Panel