@yesimsteve:

The Babyface’s XLR’s are balanced inputs that can be used a Mic or Line via the RME software. I realized it after looking at it again…

It’s a very basic Mic/Line design.
Every pro mixing desk has a switch on a channel strip that configures the balanced inputs to be either mic or line depending on what you hook into it.

If you set it to line, it bypasses the mic preamp.

With the babyface you set it in software.

If you want to hook up your AR to the babyface - do it via a TRS to XLR cable and use line level setting within the RME software.

Gain is for microphones. No need for the AR. The AR has plenty of gain when volume is at max - and by the way…the volume should be set to max when recording it to digital.

Hope this helps.
Eitan