Those are bugs in your sound driver (alsa-driver/linux), not pulseaudio.
You haven't stated whether setting PULSE_NO_SIMD had any effect,
however.
** Changed in: pulseaudio (Ubuntu)
Status: New => Confirmed
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Wrong pitch and crackling sound with 5.1 output on Extigy USB card
https://bugs.launchpad.net/bugs/518966
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