Urgent, Please help with new MIDI pedal

I just got an old awesome MIDI pedal the X-15 Ultrafoot. The pedal has two expression pedals and 10 pushbuttons/pushpads (as well as two buttons to scroll through banks, and a "mode" and "bypass" button).

What I want to is assign each pushbutton to a different parameter. I then want the expression pedal to be activated to whatever parameter I have selected. The problem is I do not know how to make the expression pedal exclusively control only the last parameter that was selected.

If somebody could help me with this I will be eternally grateful

🙂