A little help, I hope....If everything worked at one time in the past, a new soundcard, while nice, really isn't the issue and I would guess its your settings.  It has beeen my experience with Magix, that even tho' you have selected an option, everytime you re-open the program you have to re-set the option/s.  Why they change while you are asleep, I have never figured out....haven't asked for Magix supporr nor the Community forum about this issue, but yur settings would be my best guess...or your proceedures are not in a logical order...you're skipping something or trying to do to much.  

I can give some more info about what was wrong. Maybe some time it will help some one else.

I had connected the speakers to the wrong port---  the line out--- but  it should be to a port called  center/subwoofer, and I have got this kind of speakers.  This seems to have caused all my problems, also the crackle sound, I think. I had a vague visual memory of where the cable had been concted earlier.  Now having changed my settings several times I haven't managed to reset the original settings, so now I have another problem. I have a perfect Asio sound (so to speak) in MSS2013 and no sound at all when being in Windows mode. But don't worry, tomorrow I'll get some help with this.

And thanks again for your trying to help, Gnarly. I guess  it can't bee easy with us having all sorts of hardwares and softwares. 

Glad to see you are making some progress...even to' MM2013 is sort of a entry level music program, its quite complex and does lots of stuff.  You can really get yourself all confused if you just start banging away and not taking the time to figure out where you are and how you got there.