http://www.macupdate.com/download/16780/psst.dmg
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Psst is a faceless application that lets you adjust/mute the volume of your Mac's startup chime. Double-Click "Psst!" in the Finder to adjust the volume settings.
Important: The method Psst uses to change the volume does not work on every model... What it actually does: It simply adjusts the volume settings before shutting down and after logging in.
What's New
Version 2.1.1:
- Added check routine to prevent Psst from launching from disk image
- Psst asks you to anonymously submit your Mac configuration in order to create a comprehensive list of (un-)supported setups. Check it out here: www.satsumac.com/Psst/Compatibility.php
- Uninstalling Psst: just stop it and trash it!
Requirements
OS X 10.4 or later
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