Comment 94 for bug 445849

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Jerther (jerther) wrote : Re: Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala

I experience the same problem.
Sound Blaster 5.1 SB0220

Works fine in stereo mode

I found a simple fix, but it won't stay if I reboot:

- Install gnome-alsamixer (not sure about the name)
- Barely slide the PCM slider in gnome-alsamixer

here's my complete story
http://ubuntuforums.org/showthread.php?t=1377783