Audio Technica AT2020USB+ Instruction Manual page 6

Preliminary setup with Mac OS X
5. Click the output tab and make certain AT2020USB + is selected as the default output device.
(This should have happened automatically.)
Your preferences are now set to use the AT2020USB + on your Mac with GarageBand or another
recording program of your choice.
6
AT2020USB+
(continued)
USB