HDMI audio output as separate sound device (Ubuntu 11.10, Geforce 9800GT, SPDIF)

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http://askubuntu.com – I'd like to use my Geforce 9800GT's HDMI audio as a separate sound device. I'm using Ubuntu 11.10. I've installed the proprietary nvidia drivers (labelled as NVIDIA accelerated graphics driver (version current) [Recommended]), which allowed me to view an extended desktop on the television. On the graphics card itself, the HDMI audio is activated by plugging a cable into the card and motherboard (it's using SPDIF.) Ideally I'd like it to mimic Windows 7 - my computer's sound card and the HDMI audio are both listed as separate audio outputs in the Sound control panel, and I'm able to send soun (HowTos)