Finally found the answer to my problem. I uninstalled the Realtek software, and disabled all existing sound input and output devices. Then I rebooted, and connected via USB a SoundBlaster X-fi ...
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Finally found the answer to my problem. I uninstalled the Realtek software, and disabled all existing sound input and output devices. Then I rebooted, and connected via USB a SoundBlaster X-fi Go!Pro sound adapter. Installed the software on my host, rebooted it, then reset all VM guests to the default sound device. Now all my guests, whether Windows or Unix play sound.