The CS18AI is no mixer, it's a controller for a RM/RML AI rack mixer. A AVB switch is needed to bring audio to the outputs and inputs of the CS18AI. You should know that the RM/RM rack mixers are using Firewire as connection to a computer. If you don't have a computer with Firewire 800, forget this whole CS18AI thing. The AI products are discontinued, but you can still find the documentation (www.presonus.com/products/Discontinued-Products). There is also a lot of information in the Forum (https://forums.presonus.com).