KORG EFGS 1 - Manual (Page 27)

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Selecting reverb modeling effects
Use the C and D buttons to select an effect.
Use the Value dial to set the parameters.
Setting the noise reduction value
The C and D buttons will be disabled.
Use the Value dial to set the value. (0.0–10.0)
Increasing this value will produce more noise
reduction. Normally you will adjust this so that
you do not hear obtrusive noise when the strings
are lightly muted.
Setting the program level
The C and D buttons will be disabled.
Use the Value dial to set the value. (0.0–10.0)