again, multimedia keys binding problem. This time on fedora 7. I cant make my volume up and down keys to work on KDE. It works without problem on GNOME. "Keyboard shortcuts" in GNOME gives an option to assign volume keys in SOUND section; however,KDE even doesnt have SOUND section in "Keyboard shortcuts" in Control Center.I tried changing Keyboard models in "Keyboard layout" section but it doesnt help. Here is my xev:

KeyPress event, serial 31, synthetic NO, window 0x2400001,
root 0x65, subw 0x0, time 759808927, (-597,969), root81,996),
state 0x10, keycode 176 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False

KeyRelease event, serial 31, synthetic NO, window 0x2400001,
root 0x65, subw 0x0, time 759809118, (-597,969), root81,996),
state 0x10, keycode 176 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False

any ideas where I should start troubleshooting?

I had the same problem when setting up KDE for my wife, I didn't have the time nor patience to find out the "KDE way", here's what I ended up with: http://www.kde-forum.org/thread.php?threadid=15079

I also did in similar way. I copied working xmodmap from gnome, created a small script to start saved xmodmap, and put it into /root/.kde/Autostart that it would load on startup. Works good so far.

Good!
Except you are using your computer as root and that is bad, bad, bad. The most condemned and stupid thing a UNIX user can do.
Read this Security Report. Hopefully you'll understand now you trash all this wonderful UNIX security if you run as root. Nothing is forbidden for root, every malicious piece of software that can exploit a flaw in your web browser (for instance) will run with root rights.
Also please read this post and thread.