Comment 56 for bug 445849

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Fabio Albieri (chareos) wrote : Re: Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala

Actually, the workaround that works for me is BOTH remove .pulse folder AND use the PULSE_NO_SIMD=1 variable.
This way, problem doesn't come back and the high pitch seems really disappear.

I also found helpful a workaround to ignore dB in volume control, so when volume goes over 100% (absolutely crazy...) sound doesn't get distorted anymore.

Man, when I said "karmic is the easiest for sound so far" I was SO off...