what keyboard is that korg ? does it have a knob or a slider you could use ?

will it transmit the dampener pedal from the keyboard to the 3080

or you might have to just use the volume knob or a little mixer for volume control and reassign that foot controler

how about a midi cc pedal and a little midi merger box directly in to the 3080. that way you could have the keyboard and the cc pedal going directly in to the midi in on the 3080 and keep the volume pedal for volume on the korg