Archetype Gojira Expression Pedal

I recently bought Archetype Gojira and my first interface, I’m very new to all this stuff so I’m not sure which pedal I should get let alone how to connect it. I have the Komplete Audio 2 for my interface and if I need midi I can buy a midi to usb adapter. I’d preferably spend as little money as possible and only need the expression pedal part