Simple app, but from the product page -
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The method Psst uses to change the volume does not work on every model!
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As the boot chime indicates that the Mac has passed that portion of the POST, it's a good thing to hear! You can also choose to not shut your Mac down, and then the boot chime would only be heard when you need to restart. It's better than that horrible clangy thing that Windows does, both at open, and close. Now, that's something that really grates...!