Yup, just got this one too. Try running gconf-editor and setting
/desktop/gnome/peripherals/keyboard/bell_mode
to 'off'.
If this fixes the problem, is it possible to change this bug to:
Package: gnome-volume-control
Bug: Disabling sounds doesn't disable keyboard bell
--
Weird hum as "system bee
** Attachment added: "AlsaDevices.txt"
http://launchpadlibrarian.net/33492236/AlsaDevices.txt
** Attachment added: "AplayDevices.txt"
http://launchpadlibrarian.net/33492237/AplayDevices.txt
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/33492238/BootDmesg.txt
** Att