I am using Ubuntu 12.10 and I am getting jerky sound. The sound works perfectly in Windows 7 so it is not a hardware issue.
I am using a Creative Sound Blaster Audigy 2 Value sound card with a 5.1 speaker setup.
This also does not seem to be a problem with Ubuntu as the same thing happened when I tried OpenSuse 12.2 which I have replaced with Ubuntu 12.10 hoping that this will sort out the problem.
Sound works fine on boot up when I get to the log on screen as I hear the drum, but when I test the speakers after I have logged in, sometimes there is sound and sometimes there is no sound and when testing the speakers I get a jerky, choppy and distorted sound back I have made changes to the following files