Petrucci | MIDI Sweeping parameters on Behringer FCB1010

Hi, guys!

I’ve been trying to use the Behringer FCB1010’s expression pedals to control volume and wah individually.
The trouble is I have the pedalboard set up correctly but I can’t seem to use expression pedal A to control sweeping for volume. I can only use expression pedal B for that. Expression pedal A only toggles the volume pedal from 0 to max volume immediately.

Has anyone had this problem and found a solution?