[LAU] Controlling pulseaudio volume via XF86AudioLower/RaiseVolume buttons

Hey all, I'm running Ubuntu 11.04 and have switched away from the Gnome 2 DE in favour of lwm and other assorted lightweight window managers etc. One thing I'm trying to get working again is the XF86AudioLowerVolume and XF86AudioRaiseVolume (as detected by xev) hotkeys on my keyboard to lower and raise the volume of the default pulseaudio sink by, lets say, +/-5% (incidentally, I'm having issue with the Monitor brightness increase key working, but not the down key. Probably better for me to ask somewhere else about that though). Should scripting and a suitable keygrabber (lets say, xbindkeys) work for this kind of stuff, or is there hardcoded gnome2/pulseaudio stuff going on? Thanks, Andrew.