KORG Electronic Keyboard - Manual (Page 985)

Alternate Modulation Sources (AMS) Alternate Modulation settings
975
• By setting AMS to Gate 1, you can make the
Common LFO reset when a note is played from a
state in which all notes are off. For example, this
will ensure that a filter sweep always starts from
the same place.
• You can set AMS to a controller such as JS+Y, and
operate the controller when you want to reset the
LFO.