Boss GT-10 Owner's Manual page 78

Chapter 5 Making Global Settings
Firmly depress the toe of the EXP Pedal.
8.
Repeat steps 8 and 9 to adjust the Thres parameter so that the EXP
PEDAL SW indicator lights up and goes out with appropriate depres-
9.
sion force.
The sensitivity of the PEDAL SW is calibrated.
10.
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