i have solved the itunes and spotlight problem with Front Row still working.I also found the location of the "volume slider" but patching it did not help.

The location is System/Library/coreservices/menu extras/volume.menu but as i said the solution is not there.

I guess we can back up the Front Row inside System/Library then patch the whole System/Library folder and then paste back the front row.This may work but i am not willing to try a reformat just for a volume slider in case it fails (i use front row)