Control|24 connects to the inputs of your audio interfaces via 25 pin D-Sub connectors on the back of the unit. These will fan out to either XLR or 1/4" balanced connections depending on which interface you use. There are a total of 7 D-Sub connections on the back of the unit. See the Control|24 25 Pin Female D-sub Pinouts at www.digidesign.com in the Technical Documents Library www.digidesign.com For a custom built solution from Digidesign, see the next item.