Topic: Loopback recording

I have a babyface pro, and I'd like to record system audio in Ableton.
I've tried the loopback function, and recorded A/S 1-2, but the resulting sound is different than the original (as if it had some effect on it, and I used none, both in totalmix and ableton). What could I do about?
Also, is the only way to adjust the volume of the recorded audio, by maxing A/S 1-2's volume (obviously avoiding peaking)?
Thank you.

i5-6400 2.7 GHz, 16 GB DDR4 2666 MHz
RME BabyFace Pro
M-Audio Axiom 61
Ableton Live 11.3.3 Suite