To Assign an alternate function to a GK-3's Volume Knob, instead of Volume, please follow these steps:
1. Press EDIT.
2. Press PAGE Right to get to the SYSTEM page.
3. Turn the wheel left or right until the cursor is over the PEDAL/GK CTK icon.
4. Press ENTER.
5. Press PAGE Right to get to the VOL page.
6. Confirm that the page's cursor is over the GK VOL parameter.
7. Turn the wheel to select other parameters besides TONE VOLUME.