Limit volume to 100%

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http://forums.fedoraforum.org – In the sound preferences in Fedora 11, the sound can be set to 150%. I'd like to limit it to 100%. The reason I ask is because MythTV likes to monopolize the system sound. It applies it's master volume setting to the system. The default setting is 70%, which is too quiet for me hear, but if I try setting it higher, it ends up putting the master sound over 100% which sounds like garbage. The volume also grows every time I change channels. So if it's at 110%, and I change channels it's at 120%. Is there a way to keep volume at 100% or lower? Or at least limit MythTV? (HowTos)