This bug has not been reported upstream, has it? Attaching a video to illustrate the problem. Will also attach a "good quality" sound recording of the problem so PA devs can hear what it sounds like.
** Attachment added: "video demonstration" http://launchpadlibrarian.net/36491374/pulseaudio%20LP%20445849.ogv -- Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala https://bugs.launchpad.net/bugs/445849 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs