Went through quite some trouble with footswitches*) and found this thread/topic.
But it is impossible to respond (or add information). Why is that?
I'd think it it would be nice to build up or extend the knowledge base.
*) Not here to respond but for the complete story: I managed to control the UX2/PODFarm with a Boss FS6 (recommended because of the options momentary/latch); an issue is still the A/B or the A/B/Y options. But if you want to control Riffworks, Ableton or Mobius as well (as looper) you can't use it, as far as I can see now you need a USB footswitch (for example the Scythe Foot Switch)), for UX2 seems to be unable to connect through.