Download Audacity Mac User Guide

Mouse – explains how to use the mouse. It is recommended that you leave the
values as the default. Click OK.
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Using a USB External Microphone
Before starting your recording, plug the microphone into the computer (shown
below).
Start Audacity, on your Apple Mac computer. The input device will be the only
Default Input Source (Show Below) with or without the USB Microphone plugged
in.
Open the Preferences window.
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