This is an advanced topic but you can use it for playing another stream into your own or for bridging a Google Meets or Zoom meeting into your stream.
- Start by installing VB-Cable from Virtual Apps
- Once it’s installed, you can send audio to your streaming app by setting the default output to VoiceMeeter Aux Input.
- Open BUTT and set the audio device to VoiceMeeter Aux Output.
- On Mac you can use https://github.com/codingjoe/MusicBeam/wiki/How-to-setup-a-Virtual-Audio-Cable to accomplish this same functionality.