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Roland GAFC Guitar Effect Pedal for sale online | eBay
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
Used BOSS GAFC Footswitch Pedal | Guitar Center
BOSS GAFC Amplifier Footswitch for Roland and Boss Amplifiers - Ray's Midbell Music