CASTER application can receive and route audio from and to any audio device. even more, it can work with multiple audio devices together and route audio between them.
All you need to do is connect your audio interface and you will see it appears in CASTER input tracks / Microphone tracks.
On top of this CASTER has the ability to route audio to its dedicated streaming audio device “CASTER Stream Mix”. all the tracks in CASTER are routed by default to this virtual audio device.
At the same time you are streaming all CASTER tracks to your favourite streaming application you can also monitor everything in your headphones. you can adjust different volumes for your stream and for your headphones monitor.