That’s the foot controller for the Kemper. I can trigger stuff in the rest of the rack with it if I’m playing through one of the heads via the TC Electronics G Major.Very nice! What kind of multi-effects board is that? I messed around with a Boss GT-1000 not long ago and was super impressed, for the price tag I suppose I should be. Agree on modeling amps, for the money the Katana is one of the best amps out there.