I have this problem too, afer installing ubuntu 9.10,
i solved it a little by setting in alsamixergui the level of all to the same.
or if i change output to 4.0, then is no fluctiation, but i cant hear  bass and 
one speaker

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Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala
https://bugs.launchpad.net/bugs/445849
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