Changed the USB sound card to a USB sound card with SPDIF. The FX3800 does not have it's own sound device like a Radeon. It has audio passthrough. It has an SPDIF connector & what looks like an audio connector similar to those found on a cdrom, but this connector does not accept audio in like the SPDIF, it's for something else.
I am currently using the DVI connector from the GPU --> HDMI in on the switch. I a working on dressing the cables, and my research indicates the best way to get audio out of this box is from the USB SPDIF --> spdif in on the Quadro ---> Display port out ---> HDMI in on the switch.
To enable passthrough of the GPU, the onboard graphics, deep render, deep render standby, & onboard HDAUDIO must be disabled. Therefore to have sound from the various VM's, we need some other sound device that can be passed through to the VM. SInce all USB's are passed through, we can use a usb sound card with SPDIF.. The other option would be:
1) more expensive Nvidia GPU with sound, which is certainly possible for some builds.
2) Radeon GPU with sound, but nearly impossible to get Android up on
3) Mini ITX board with additional mini PCIE, like the WiFi version of the spec board. Then a mini-pcie sound card with SPDIF. - IF the board supports a not WiFi card in this slot.
The USB->SPDIF is $14, so this is the solution for now.....We'll have to see what it sounds like.....