Audio mixer greyed out on TVS

Just started using a ATEM Television Studio. I'm passing SDI signals with embedded audio and have also patched audio via the AES/EBU input. However, the "Audio" panel within the software control panel is completely greyed out.

Any ideas why?

I think I figured it out. It seems like the TVS only supports audio via the AES/EBU input. Is that correct? And it simply passes it along to the output, embedded via SDI or HDMI? That will work for me, I just want to make sure I'm not missing something.

Annnnnd.... the new version of the software adds audio mixing.