Roland GA‑FC Foot Controller for Boss and Roland Amplifiers – Flipside Music
Boss GA-FC Foot Controller | Sweetwater
Katana - Using the Roland GA-FC Controller
Boss Katana Family – Which One is Perfect for You?
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
KATANA-50 | Guitar Amplifier - BOSS
Katana 50 first impressions, well,,, | Page 2 | The Gear Page
Amazon.com: Boss GA-FC EX Foot Controller for BOSS Katana Amplifiers : Musical Instruments