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Setting Max Volumn in Ubuntu 11.10 with Gnome Shell on a Macbook Pro

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http://askubuntu.com – How do you maximize sound volume in Gnome Shell under Ubuntu 11.10? I have a Macbook, and my sound and volume keys generally work, but even if I use the volume keys to set volume to 100%, the sound is very low. However, if I open the Sound dialog, the "Output Volume" slider goes up to 150%, which allows me to comfortably hear sound. Unfortunately, if I use the volume keys thereafter, it practically mutes the sound again, and doesn't let me increase the volume to 150% without first opening the Sound Settings dialog. (HowTos)