Yes you do need Kitserver 6. But if you go to the links above and download the Shollym patch...Kitserver is included.
Just a quick walk through from memory. I may be missing something:
Install PES6 normally. Start and create a new option file.
Download the patch from here:
http://www.filefront.com/user/Shollym
the o_sound, e_sound, opmov, e_text, etc...go in the DAT folder in Program Files/Konami/Pro Evolution Soccer 6 or wherever it's installed on your computer. You can just replace what is already in there.
The Kitserver folder and the PES6.exe go in that same Pro Evolution Soccer 6 folder, but outside of the DAT folder. Just paste the PES6.exe over the existing one.
The option file will go in Documents/Konami/Pro Evolution Soccer 6/save/folder1
Make sure that kitserver is installed to the PES6.exe by opening setup in the kitserver folder.
Run game and it should be cool. I may have messed up or omitted a step so let us know if it works.