Hi, I just received my Mackie Profx12v3 mixer. I can't find how to setup/route my 2016 MacBook Pro anywhere. I'll be using the mixer as a backup when out DJing. All I want to do is connect my MacBook Pro > mixer > powered speakers for iTunes, etc. Setup/settings on the MacBook Pro is where I'm mainly stuck. I'd sincerely appreciate any help for getting me up and going. Thanks, Ray