Fixed the problem with the Source Audio pedals, here's the MIDI controller in action now:
I accidentally messed up the LEDs on the right while closing the enclosure, but I'm too tired to go fix those now (and anyway the patch number will appear on the Zoom unit, so I'll use that as my actual indicator until I get down to fixing the LEDs I guess).
I also made some changes to the code, instead of going back to a default "off" state if you press the footswitch twice, I'm just setting the footswitches to send. That's more manageable for me.