GR-33: Assigning the S1/S2 Buttons to Change Patches.
It is possible to have the S1/S2 switches change patches in the GR-33 instead of using the on-board pedals. Use the following steps to set up this function:
1. Press SYSTEM.
2. Press PARAMETER Right to select "S1/S2 FUNCTION."
3. Turn the VALUE dial to select "PATCH SELECT."
4. Press PLAY to exit.