Reply to Grab audio signal

hey there.
my brand new digital jockey 2 interface edition just arrived. i've connected this wonderful midi-controller to my living room audio and now the question how to grab the audio signal with my pc is turning around my head.
the delivered version of traktor does not support the recording function.
so can anyone help me by explaning how i can grab/record the audio?

thanks for any reply.

and btw happy new year ; )