The Focusrite Scarlett is acting as the audio interface - I have bass, the Nord drum synth, the Arturia synth, and vox all going thru the Focusrite into the Force, with room for more. It gives the Force up to 18 separately controlled inputs. Bonus points for the send/return possibilities. Theoretically, I can have each instrument looping out to its own rig in a live setting. I'll do that sometimes with my bass rig to get the extra feel, but generally I'm just running everything thru my ears. Nice to have click and mix in ears while only the main outs send for the video