Note
This article applies to ManyCam for macOS only.
On Mac, capturing System Sound is a bit complicated due to macOS limitations. We suggest using the app called Soundflower (download here). It was designed to address this particular issue. Please also refer to this tutorial to set up Soundflower properly.
Once you selected Soundflower as an input device, select it in the ManyCam Audio Tab as a microphone and you’re good to go.