Hi -- If you look at the names at the top of those faders those are the new Configurable Audio Channels. So you don't use the legacy entries for the SDI or XP but the correct fader that you have now assigned that audio too.
Think of it like a "patch panel". You now have Faders on a Mixer and you assign the channels of audio that you want to them. In the editor those channels will be called Audio 1-xx unless you rename those channels..If you look at your Config Page of the Audio Mixer page. You will see the assignments to the Faders.
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