Set min max value expression pedal

I have a USB Expression Pedal connected to the Widget controlling a Gain.
How to set min max value expression pedal, is this set in GP4, or does it need to be set from the pedal?
I need the max to only be 70.7 (which is the default max on the Gain Balance control)
Currently min=0 max=100

Generally you should always leave physical devices at their full range and configure the desired scaling inside gig performer. If you change the pedal itself, then you just lose flexibility (how are you going to change it to something else in the middle of a show?)