I use all 3 stompboxes (TF, PF, MF) with a gig rig pro 14 but with the partial (bottom rail) midi mod only. And yes, you can only do program changes. I also use an RJM mini amp gizmo to switch my channels as well with it. I'm actually just limited to 7  midi presets as of now but I love the fact that I can just turn on any loop on the fly with a push of a dip switch. I have on order a compact 4 preset/button midi foot controller that I will connect the eventide stompboxes just for midi switching (PCs and CCs  ) and use it with the gigrig pro 14 so i can actually save more presets into banks whether I use 1 pedal or a combination of all three.