If you have an external microphone, say a USB microphone or an audio interface system you’re plugged into, you need to configure some settings before you can record audio from the mic. Here’s a quick video on how to configure your settings! Disclaimer: the video was filmed in 2014, so your adobe audition interface should (hopefully) be updated from that older version. Even though he’s using Audition from 2014, the settings are still basically the same.