Reply to Recording with A6 - tell me what I'm doing wrong.

I'm trying to record with turntables, xone 32 and an A6
I have routed my "rec out" on my mixer to the "main in" on my A6
I have my "mix recorder" in preferences set to external, and "external input" is set to deck c.
But traktor does not seem to be able to pick up any sound.
This routing makes sense in my head, but obviously im doing something wrong.
can someone please offer some advice.

Also, if someone can help me by explaining how to setup traktor and my routing so that I can route my sample decks C and D to the third channel on my mixer that would be awesome.

Jay