HI all,i have just bought a Xonar Phoebus solo and i have some problems. i'll just explain one of them

If i keep my headphones (with mic) always connected to the card i can switch from speakers to headphones using the software ROG Xonar Phoebus but i noticed a bad thing.
Passing to headphones i have no problems but going back to speakers i lose my settings! now i have set 5.1 (with Xear surround max activated) but after coming back from headphones,it's like i set 4.0
This happens with ALL softwares (video player,audio player,games) so it's not a software related problem like others i have (and i don't explain here)