StartupSound – Adjust the Startup Sound Level
The startup sound on a Mac is cool and all, but if you’re in a quiet library, office, or classroom, that sound can be a bit obnoxious to yourself and others. StartupSound is a simple preference pane addition that enables you to adjust the sound level of the startup sound, or even mute it entirely. Installation is easier than pie, and the interface is as simple as it gets. So save yourself the embarassment of public boot sounds and check out StartupSound!