Korg EFGS 1 Owner's Manual page 26

The value display will indicate "Gt" for approximately one second if you've
selected a guitar amp cabinet, or "bA" if you've selected a bass amp cabinet.
Selecting and setting parameters for modula-
tion and filter-type modeling effects
Use the C and D buttons to select an effect.
Use the Value dial to set the parameters.
Selecting delay modeling effects
Use the C and D buttons to select an effect.
Use the Value dial to set the parameters.
Setting the delay time for the selected delay
The C and D buttons will be disabled.
Use the Value dial to set the value.
SLAP1–5 (0–500ms), DELAY1–MULTI5 (0–2 sec)
You can also set the delay time by pressing the
TAP/TUNER button repeatedly at the desired interval.
If any of SLAP1‐5 have been selected, a quarter of the interval between
each press of the TAP/TUNER button will be used as the delay time.
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