KORG EFGS 1 - Manual (Page 21)

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This uses the same reverb as the program effect. This parameter has no
effect if you have selected a program that does not use reverb modeling,
or if the reverb effect level is “0.”
No changes to the settings in this mode will be retained if you turn the
power off without switching back to Play mode.
Edit mode
Turning effects
on or off
Moving pages
back and forth Selecting
the type
In this mode you can turn each effect on or off,
and edit the effect type, parameter values, and
program name for each program.
In Play mode, press and hold down the PLAY/
EDIT button for approximately one second. The
Edit indicator (see p.14) will appear and the
unit will enter Edit mode. You can also rename
or write programs (which you can save as user
programs) in Edit mode.