Vortex Sound Research

Yesterday I bought the Erica Synths DB-01 and oh my god this thing is insane! I already love it. Anyways, I want to connect it to FL Studio but I don't know how. I connected my DB-01 to an audio interface which is going to my laptop. In the FL Studio mixer, I select IN 2 (which is the input of the DB-01) but it doesn't work. How can I fix is? By the way, the DB-01 doesn't have a usb port.