Realtek audio driver? It doesn't work with the ATI 5xxx, you must use the ATI driver.
and my analog card "echo Mona" won't work either. But if I play a movie with standard audio say ac3 448 It will play and passes only 2ch audio to my 6 ch mona. As I said in other posts it must be TMT3 relation with my mona that's the problem. I doubt that can be fixed