Reply to Need Tips on External Mixing

After a while of trying to figure out how I want to upgrade my set up I have come to realize I want to go with external mixing. I have recently read Ean Golden's article on it. I'm still unsure how it actually works. I'm believeing about getting a Traktor Audio 6 but I'm not sure how I would route my Decks through it and how Decks C&D as remix decks would work. I'm just curious of other peoples set ups and how they externally mix.
Help is much appreciated!