Help setting AH2 as both Audio interface+Overbridge

I need help understanding the Signal flow in AH

I want to use Overbridge to saturate one track inside Ableton. For this i need to put AH2 into Overbridge mode in the USB settings on the AH2.

If i then send the Mix Bus to the AH2 audio interface OUT 1+2 and go to an outboard Hardwear and Back. Will the returning audio be also affected by the AH or is it working like a typical Audio Interface? I have read confusing opinions here and there from people claiming it alters the audio simply by using the Interface, which would be a bit odd i must say as from the technical specs it seems like a solid Interface?