DDJ 400 + External mixer Xone DB2

Hi,

Simple question. Can I use DDJ 400 decks only to control Rekordbox but use my Xone DB2 internal sound card (and mixer) as a mixer?

Or is this unit "locked" to use DDJ 400 mixer only? I want to use it ath home to practice and in my studio with my Xone mixer to record sets. I prefer to use my hardware mixer instead of DDJ 400 mixer in studio for that. Is that possible? Can I route sound inside Reokordbox to my Xone DB2 soundcard and use DDJ 400 decks to control Rekrdbox? 

Thanks for reply! :)