adjust max possible volume in pulseaudio

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http://askubuntu.com – Somtimes some sound/movie/music on my Ubuntu_12.04 system is at a very low volume by itself. Henceforth I increase the volume of the sound output. I can use the following setting (see screenshot) It seems therefore that pulseaudio is able to increase the volume beyond the maximum that appears possible by merely using the "increase-volume" buttons of the machine. My questions is how I can adjust Pulseaudio to allow a greater range or a higher max volume increasing??? Especially with some audio material that is at a very low volume to start with it would be nice to be able to swiftly increas (HowTos)