The Carbonite series of switchers all handle audio slightly differently depending on if they have a built-in audio mixer or not. The following are some links to see how audio is processed with each Carbonite.
Carbonite:
https://help.rossvideo.com/carbonite-01/Topics/Operation/Basics/Audio-Flow.html
Carbonite Black:
https://help.rossvideo.com/carbonite-02/Topics/Operation/Basics/Audio-Flow.html
Graphite:
https://help.rossvideo.com/graphite/Topics/Operation/Basics/Audio-Flow-Graphite.html
https://help.rossvideo.com/graphite/Topics/Setup/Audio/Mixer.html
Carbonite Ultra:
https://help.rossvideo.com/ultra/Topics/Operation/Basics/Audio-Flow-RAVE.html
https://help.rossvideo.com/ultra/Topics/Setup/Audio/Mixer.html
Ultrix Carbonite:
https://help.rossvideo.com/ultrix-carbonite/Topics/Operation/Basics/Audio-Flow.html