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Since I installed Catalina, everything works fine except sound. Can someone help how to get sound working? My computer is Alienware Steam Alpha R1

I have the Alienware Steam Machine running High Sierra after upgrading from Sierra. I have almost everything working perfectly. However, 5.1 surround sound does not work. I DO HAVE sound, just not 5.1. I do the Audio Mini Setup which automatically shows 6 channels but whatever speaker icon I...