SPDIF/ Sound issues

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http://chakra-project.org – About 1 year ago, SPDIF worked on this system (same hardware, have reformatted).  I had a horrible buzzing through analog with the volume up, but SPDIF worked wonderfully and the buzzing goes away with the volume at about half on the audio receiver.  I don't have time for movies or games or much with sound, so when an update broke my SPDIF, I didn't worry much.  Now I have more time, and want to fix SPDIF, or at least fix the buzzing.The computer system settings do not seem to matter.  The buzzing starts when the system boots, and no amount of muting or playing wi (HowTos)