Good use of the MIDI event monitor,
we'll make a tech-head of you yet ....
OK,
well I took a quick trip to
http://www.midi.org/about-midi/table3.shtml
the "Foot Controller" message is, in more technical terms,
MIDI continuous controller No.4
So map away with that in the Program Modulation Matrix and you should be laughing.
(NB continuous controllers have a range of 0 to 127.
Does your pedal just jump between two values though, for open and closed?
You'll have to experiment with the modulation depths in the matrix and the Zone page to find the right threshold for changing your zone -
but with the distinctive open and closed hi-hat samples, it should be easy to hear when it works)