by gullum on 15 Sep 2014, 10:40
you will need a 2 stereo out sound card.
I assume you are using the 850's as sound card for deck A/B so you would need to use the 2 stereo sound card for deck C/D.
Depending on if you using Windows or Mac you'll need asio4all (Windows) or to aggregate your sound cards on Mac.
Now You also need the right mappings for the MIDI controllers.
something cheep like the MixVibes U-Mix 44 will do the job