Korg M1 Owner's Manual page 40

Parameters of each mode
VDF EG
VDF EG SELECT
Specifies whether the VDF EG1 or the VDF EG2 will be
shown in the foreground.
VDF EG
Drag the points of the graphic envelope to specify the shape
of the VDF EG.
VDA EG
VDA EG SELECT
Specifies whether the VDA EG1 or the VDA EG2 will be
shown in the foreground.
VDA EG
Drag the points of the graphic envelope to specify the shape
of the VDA EG.
INSERT FX
FX1/FX2...............................................................[OFF, ON]
Switches each insert effect on/off.
FX1/FX2 EFFECT TYPE .... [No Effect, Reverb...Delay/Tremolo]
Selects the effect type.
FX1/FX2 DRY/WET ............................[DRY, 001...099, WET]
Specifies the effect level.
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If you're using the composite effect (Delay/Hall etc.)
as an insert effect, and if the "DRY/WET" values differ
between Delay and Hall, the Delay value is shown
here.
If you've selected a composite effect (such as Delay/
Hall or Delay/Chorus) as an insert effect, editing
"DRY/WET" in the EASY page will set the "DRY/
WET" values of both effects to the same value.