Here is a link to my XML file with all the icons, sounds, etc.
These forums don't allow code to be copy/pasted in that's why I provided the link.
Yes. Name them exactly as it is in the file from the link. Without names the programs don't know what to look for.
There are 5 sounds you can use/create:
1. optionmenu (accessing infobar on right side)
2. decide (accessing sub-menus)
3. cursor (shuffling thru XMB or typing)
4. cancel (backing out of sub-menus or choosing ‘no’)
5. system ok (when you choose ‘yes’)