OS X 10.4.11 iMac 1.25 Ghz PowerPC G4 20” Flat panel

I am trying to use the interface builder to alter the TextEdit Preferences panel. I am trying to add sounds that play when a button is selected/checkbox checked etc.

I added some aiff files to /System/Library/Sounds and they were ignored. My sound was named “Laugh.”

I stripped the OS X-supplied sound “Morse” of its name and renamed my “Laugh” file as “Morse.” It now works.

Fine… but… does anyone know how to make OS X recognize the sounds I add to this folder so I can use them just like the OS X “original” sounds?