Well... JU has 4 patches per bank. I don't remember how many banks, but they have 4 selections each.
With this, I plan to use the 4 BB buttons for the 4 patches, then scroll up and down through the banks with 2 momentary switch foot pedals. I should add that I'm not absolutely sure I can do that, but I can't believe they'd make it impossible to do that.
On a side note, I have JU pro and JU free that I dual amp with Audiobus. I picked up the free JU then got the bass expansions, then when JU stuff went 1/2 price I picked up Pro the bass expansions, and the effects expansion. The BB changes both Free and Pro, even running in the background.
If I was suuuuper critical, I would have made the pedal just a bit wider. The buttons are a bit too close for my taste. I'm sure I'll get used to it though.
Now all IK has to do is make that Lightning cable hub so I can use a MIDI device, I/O device, and charger at the same time, without having to carry my iO Dock.