KORG The iS40 - Manual (Page 19)

Korg iS40 Guide
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chord. However, this can be changed on page 11 of Global mode. For more information
on chord scanning and recognition, consult the owner’s manual.
The number of notes you have to play for the backing tracks to detect a chord depends
on the settings in the Chord Recognition mode (page 11 of Global mode). The default
setting is FINGERED2, which means that three or more notes have to be played to
trigger chord scanning. This can be changed to even include the “easy” fingered method
as adopted by Yamaha for the more novice player. See the manual pg. 131 for more
information.