I think you can do that in System >> Preferences >> Sound
Pulse audio is causing lots of problems including full system lockups and weird
sound bits like this.
** Changed in: pulseaudio (Ubuntu)
Sourcepackagename: firefox => pulseaudio
Status: New => Confirmed
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After (and sometimes, while watching) flash videos, I got no sound at all
https://bugs.launchpad.net/bugs/226684
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