SoundSource
(3 votes, average: 4.33 out of 5)
SoundSource is a tiny tool for OS X enabling you to switch your audio input and output sources with a single click.
And with the System setting, you can transfer system beeps to a secondary audio source so you won’t be disturbed.
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http://www.rogueamoeba.com/freebies/ (394 clicks)
Popularity: 2%