Alert Expansion

Alert Expansion is a pack that installs 30 cool alert sounds to complement the default ones in OS X. It features more than 30 joyful, fun sounds that will surely add a cool vibe to your computer.

You can listen to them under Preferences in the Sound settings. Click on any item on the list to play it.

If you can't wait to find out what's inside the pack, some of the sounds you'll find are: a photo camera, a splash in the water, a chimpanzee, a helicopter, a racing car, a golf hit, a dog barking, etc.