Boss GT-10 Owner's Manual page 17

Switch the Patch with the Dial
When you're at the Play screen (p. 23),
turning the dial switches the patch.
Working with Effects Using the Pedals
The EXP Pedal and the CTL 1 and 2 pedals can be set to use in
switching effects on or off for individual patches, use as a volume
pedal, and other such operations.
Executing these operations during a performance lets you modify
the sound more effectively.
Press the CTL 1 pedal.
The CTL1 pedal function is switched on.
(The indicator for the CTL 1 pedal lights up.)
Press a second time to switch off.
(The indicator for the CTL 1 pedal goes out.)
Press the CTL 2 pedal.
The CTL2 pedal function is switched on.
(The indicator for the CTL 2 pedal lights up.)
Press a second time to switch off.
(The indicator for the CTL 2 pedal goes out.)
Press the toe of the EXP Pedal.
The EXP Pedal value rises.
Press the heel of the EXP Pedal.
The EXP Pedal value decreases.
Press the toe of the EXP Pedal firmly.
The EXP PEDAL SW function is switched on.
(The EXP PEDAL SW ON/OFF indicator lights up.)
Press firmly a second time to switch off.
(The EXP PEDAL SW ON/OFF indicator goes out.)
You can assign the parameters you want to the EXP Pedal, EXP PEDAL
SW and the CTL 1 and 2 pedals and operate them accordingly. For more
information, refer to "Using Pedals to Control the Parameters" (p. 47)."
Quick Guide
17