The System sounds are located in /System/Library/Sounds You should put your custom sound files in ~/Library/Sounds If that folder doesn't exist, create it yourself. However, I don't know that the system will accept MP3s. The built-in sounds are AIFF, and I know it will also use WAV. Eddie Hargreaves On 11/17/05 12:28 PM, Lee Licata <lazilicata at gmail.com> wrote: > I have a sound file (either mp3 or wav file) that I want to add to the > sounds my 10.3.9 powerbook can make. > > I tried to find where the "base" sounds (Sosumi and al..) are filed and > could not. I searched by name, and even searched for invisible files. > > No luck > > Can someone help me please?