If you are trying to include audio from multiple sources, such as music from a media player or webpage as well as the microphone, then you would need to use an audio mixer to combine the audio together and create a single input device that can be selected in Studio.
The same would go if you would like to capture audio playing from the desktop without screen sharing and not include microphone audio.
For Windows computer, you can use an audio mixing software such as VB Audio Cable
Here is how to install VB Audio Cable:
Download VB Audio Cable from https://www.vb-audio.com/Cable/index.htm.
Unzip the downloaded file.
Run VBCable_Setup.exe or VBCable_Setup_64.exe.
Step through the wizard.
Reboot once you’re done.
Once it's installed, VB Audio Cable can be selected as the output option for the audio you wish to include.
For instance, if you wanted to include audio from a media player you would need to select the CABLE Input (VB- Audio Virtual Cable) as the audio device within the media player or software where the audio is being played from.
Then, select VB Audio Cable as the "Input" option within the Restream Studio.
However, if you want to capture Microphone audio along with the other audio, you'll need to adjust the Microphone listen settings to output to VB Audio Cable.
Go to your System > Sound options and select "Device Properties" for your microphone.
Next, click on "Additional Device Properties".
Then, click the "Listen" tab.
Check the box for "Listen to this Device". Then, choose CABLE Input (VB-Audio Virtual Cable) as the Playback through this device and select Apply.
Now both audio playback from the media source as well as microphone audio will be included in the Restream Studio!
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