Roland GK-2A Owner's Manual page 6

PANEL DESCRIPTIONS
(6) Select Switch
The functions provided by the Select switches
will differ depending on the [GR] model you
are using.
Please refer to the owner's manual for your
[GR].
(7) S1 Switch
(8) S2 Switch
The functions provided by the S1/S2 switches
will differ depending on the [GR] model you
are using.
Please refer to the owner's manual for your
[GR].
6