Yes, You can.
All you need for digital DJing is a 4 out (2×2 Stereo Channels) audio interface and a laptop/sound system. The only software which requires certain controllers to make it work is Serato – but most controllers released now support Serato fully anyway.
To reduce latency, make sure you have the most up-to-date drivers installed and make sure you are using the “ASIO” drivers in Traktor for the Kontrol Audio 6.
As I understand it, If you wanted to use a DVS (Digital Vinyl System), then you would need the Traktor card. But as you aren’t, you can use any audio interface you like. I know people who use a Numark DJIO as their soundcard through Traktor and it works absolutely fine 🙂
bob6397