Sounds are identified by their unique icons. Under System 7, you can play a sound by double-clicking the sound file, whether it is inside the System file or loose on the disk.
Sounds installed in the System file must be sound resources, in particular, resources with the type "snd". (You can check the resource type by using ResEdit.) If you are able to drag a sound file into the System file, then it is in the proper format. There are several third-party sources for sound resource conversion applications.
To change the system alert sound:
1) Open the Sound control panel. This is usually located in the Control Panels folder within the System Folder, or accessed via the Control Panels menu item in the Apple menu.
2) Click the name of the sound you want. The sound is played.
3) Adjust the volume, if desired. The alert sound is played to demonstrate what it sounds like at the new volume.
Warning: The instructions in this article refer to using ResEdit. Apple Computer, Inc., is not liable for any damage done to your software through the use of ResEdit to alter software.