if you route it like you did: both RCA go into the ddm 4000 then you mix externally and dont map the 2 channels you have audio routed to, everything mixing (EQ, faders) are externally on the mixer.
if you want 4 channels with your 2 channel soundcard you'll have to map everything in traktor and use the ddm 4000 as a MIDI controller. then you plug your speakers and headphones directly into the soundcard
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