Aha!: I tried "Turning off PulseAudio timer scheduling" from https://wiki.ubuntu.com/Audio/PositionReporting . Now sound appears normal in all three programs mentioned.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1008177 Title: glitchy (pulsing) sound on Alienware box, 11.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1008177/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs