On your OBS, add a new scene first and name the new scene with your preference. Just follow these steps, and make your OBS audio recording easier. How to record desktop audio on Mac & Windows with OBS.Then click the Microphone/Auxiliary Audio Device drop-down menu to select the right device there if. Then select the right desktop audio device. Click the Desktop Audio Device drop-down menu if the right device is not selected there. Select the Audio tab shown directly below. There are different reasons for OBS not picking or detecting desktop audio, or the desktop audio has stopped working. In this troubleshooting guide, we will explain the 6 best ways to solve OBS mic not working, OBS not picking up the mic, OBS sound not working, and OBS desktop audio not working.