XDJ XZ - External Mixer / Sound Card

Hi,

I'm hoping to get a XDJ XZ at the end of next month but I'm just wondering if anyone has tested the usb sound card of the mixer with other applications? Could channel 3 and 4 be routed independently to traktor or ableton as an example just like most pioneer mixers with a soundcard?

Also as traktor 3 DVS no longer needs certified mixers, has anyone tested traktor DVS with channels 3 or 4? Is that possible? I'm not looking to map to traktor or anything but it would be nice to have 2 internal decks with rekordbox usb and the outer channels 3 and 4 for traktor or ableton use etc.

Thanks