Sound under Linux is often a big problem. I have solved this problem partially by using the JACK Audio Connection Kit. Here is my configuration:
It looks pretty difficult
I had to try several times to get an acceptable solution. By the way, I am using Audacity in conjunction with JACK.
[...] differs a little bit from my previous setup. My setup isn’t perfect yet, but the numer of x-runs is most of the time in an acceptable [...]