Haven't seen a lot of examples of boards that implement the GA-FC, so here's the one I just put together! (Also posted in r/guitarpedals) : r/BossKatana
Boss GA-FC Foot Controller | Electric Violin Shop
Boss GA-FC-EX Expanded Foot Controller – Easy Music Center
Boss GA-FC Footswitch Controller - Used
Guitar Pedal X - GPX Blog - Boss's new GA-FC-EX Foot Controller Massively Expands on the Control Capabilities for Katana Amps
The GA-FC: Unlocking Performance Potential with Your Amp
The GA-FC: Unlocking Performance Potential with Your Amp
Amazon.com: Roland GA-FC Foot Controller for GA-112 and GA-212 : Musical Instruments
Compare AIRSTEP Kat and BOSS GA-FC - YouTube
NEW BOSS GA-FC Foot Controller for Katana Amplifiers - Eclectic Sounds