External FX Volume Issues

I’m using an SSL stereo bus compressor patched into my UR interface. I had the same issue at my studio which uses a motu 24a.

Everything is assigned correctly, but the return volume is something around 11db louder, even with the comp disengaged. I understand adjusting send and return levels, but it just seems a bit extreme. Has anyone had similar issues? My comp was also just serviced and calibrated so I’m really scratching my head

Check if your soundcards output setting is not consumer device –10 dBV level.

It does sound like there is a -10 dBV / +4 dBu mismatch somewhere.