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If I'm listening to something in Pandora or YouTube, and I'm in in OS X 10.7.5, if I use the up arrow to scroll through bash command history, then that works fine with no noises. But, if I scroll down past the last command in bash history with the down key, it makes a noise (somewhat the noise that is made when plugging an instrument cable into an amplifier). I've also noticed that some other actions will cause a similar noise, but I don't remember what they are at the moment.

Any idea what is causing this or if there is a fix?

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I'd guess it's the terminal bell: check the preferences for your terminal application to turn off the sound – glenn jackman May 9 '13 at 19:37
Awesome! That was it! Repost that as an answer, and I'll accept it. Thanks! – Gary S. Weaver May 9 '13 at 19:55

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