Can't get pedals to work correctly

Having some issues getting my two ernie ball pedals to work with the mfc. I have them connect to xp 1 and xp 2. the pedal connected to xp1 acts like a volume pedal. when i go into the vol block it does not move the modifier graph when on external 1 or 2.
my other pedal will move the modifier graph but only when on external 1 (and it's plugged into xp2 on the mfc!). I feel like i am missing something basic about the settings on the mfc and or ultra. Any help would be appreciated. thanks.
 
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