Im afraid that I dont have a specific answer. I only run the linux version in text mode for hosting purposes.
But Im sure you can count on it not being a big problem with the purchased version.
The reason I think so is that:
A) its not a "linux supported" game. Its a Linux game. Windows and Mac are "supported" (ported to) from the Linux version
B) Its developed on Ubuntu
C) Johan K. is the guy who develops it
What kind of other applications on your system are using sound now?
it suddenly works!! I uninstalled the pulseaudio packages, reinstalled and for some reason it worked! Must say that the music is really nice Am now fully exploring the demo Thank you for your quick replies and suggestions!!