Ah, this is the information I have been looking for 
Although, not sure if I’m ready to buy an expression pedal based on this 
Does it matter what is connected to ring and sleeve? 
Does calibration allow both wiring options? In other words, can MM reverse the values or does the min value need to be smaller than max (or toe/heel position) 
Edit:
In the post above an expression pedal with wiper in ring works with the MM. I checked from FCV100 manual that that is the case
I’m getting a bit confused