Go to the destinations tab and click Add New Destination.
Give the destination a Name.
Click on the Stream Name drop down menu and select your stream. This stream needs to have multiple channels of audio.
Adjust your Stream Encoder if needed.
Click on the Audio Track dropdown menu and select the audio channel you want to go to your stream.
Passthrough is the default option.
Next to each Track is the Packet Identifier which is used to differentiate audio streams that are being transmitted within the same transport stream.
The track can be switched while it’s connected to the destination. Go back into the Destination settings, select your new track and press save.
It can take 30-40 seconds for the switch to happen.