Do you have an Intel system with Hyperthreading turned on? In my case I was able by editing one of the games' XML files to tell it to ignore 4 of my 8 "cores" (on a quad core system) since according to Windows' ressource managerSound hasn't worked for me properly since regular beta. Popping, static, and cutting out of sound periodically has been the norm. dxdiag info was uploaded etc... sound works perfectly in all my steam library of games. I ticketed it and it was ignored during the transition to live. I haven't tried 1.1 yet though so we'll see tonight.
ED never managed to unpark any of my 4 HT cores anyway (whose extra performance should be quite negligible) so the game was probably running with the expectation of threads being distributed across 8 cores but in reality it was only 4, meaning some threads always had to wait which of course is a killer for low-latency audio...
(As for which XML file it was I'm sadly unable to check since I'm in the hospital with a smattering of pneumonia, but I think it was next to the games' executable...)
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