HOTONE 2 in 1 Passive Expression Footswitch EXP Pedal Ampero II Press(Included 1 PCS Additional 15 CM TRS Cable)

You didn't say what model of Gen 3 you have. That could make a difference depending on what inputs you have.This is what I use. Expression jack plugs into the amp and the toe switch plugs into the GA-FC EX. Volume when off, click the toe switch to turn on pedal FX. https://a.co/d/0fJmR8IP