On GK-3 pickups and the Roland Ready Strat (GC-1), the S1 and S2 buttons are set up at the Factory to go up or down a GR-55's Banks. If yours are set to control a different parameter and/or you wish to set them up to change individual Presets.
Here is the process to Assign S1/S2 buttons to go up and down Patches:
1. Press EDIT.
2. Press Page Right to Select the SYSTEM tab.
3. Use the Left / Right buttons around the Wheel, to Select PEDAL/GK CTL.
4. Press ENTER.
5. Press Page Right to select the S1 tab.
6. Depending on how you want to buttons set up, turn the wheel until either
the parameter named: PATCH NUMBER DEC, or PATCH NUMBER INC is showing.
7. Press Page Right to select the S2 tab.
6. Depending on how you want to buttons set up, turn the wheel until either
the parameter named: PATCH NUMBER DEC, or PATCH NUMBER INC is showing.