Second sound card is unusable?(solved)

Am I understood right? This software can utilize only one multichannel sound card, not two cards?
Many years I use the notebooks for work. I have an external soundcard and all programs I used (traktor, mixmeister, vdj etc) allowed me to route master signal to the primary sound card and preview signal - to the secondary one.
Now I bought Cross DJ for the great Video DJ ability, but has been very disappointed that I cannot utilize it by usual way.
As I think Is it not too hard to implement this very important feature?
Many years I use the notebooks for work. I have an external soundcard and all programs I used (traktor, mixmeister, vdj etc) allowed me to route master signal to the primary sound card and preview signal - to the secondary one.
Now I bought Cross DJ for the great Video DJ ability, but has been very disappointed that I cannot utilize it by usual way.

As I think Is it not too hard to implement this very important feature?