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How can I disable that annoying buzzer sound in OSX Lion that I get when, for example, I'm at the terminal and press delete on an empty line?

I tried to modify the sound settings by unchecking "Play user interface sound effects" but it didn't work.

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2 Answers 2

up vote 11 down vote accepted

Well, almost. What you want to disable is the "Alert sound", or an audible bell. You can disable it by turning down the Alert volume.

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2  
7 seconds faster and a screenshot... –  Daniel Beck Sep 7 '11 at 15:58
    
Gotta love Paintbrush.app :) –  slhck Sep 7 '11 at 20:22

Turning off the Alert Volume in Sound Preferences is very easy; the only drawback is that it will silence other system sounds as well, for example file deletion, trash-emptying.

A slightly harder approach is to use an app (for example the free app Audacity) to create an empty or silent sound and export it as Silence.aiff to the /System/Library/Sounds folder. Restart preferences and now you can select "Silence" as your alert sound. Or maybe try googling for silent aiff.

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