Setting up recording in 2103 Vilas Hall iMac Audio Booth
Navigate to Preferences > Audio Hardware…
Change the Default Input device to Scarlett 2i2 USB.
Click Yes if the dialogue box pops up.
Select File > New then choose between a Multitrack Session… or an Audio File…
An audio file is a single audio track, where one microphone is the left channel, and the other is the right channel. A multitrack session will allow you to record individual tracks for each microphone. If choosing an audio file you will just need start recording. A multitrack session requires just a small amount of setup.
For a multitrack session you need to set the input source as shown in the image. If you are using both microphones assign the other input to track 2.
Finally, click the R to enable recording for the tracks you are using