I recently sold my RME now that RPi4 USB input is working well
Here was my multitone.
Note my measurement methods have improved since I did this 1 or 2 years ago?
Note the 120dB SNR range of the much cheaper SMSL D-6 running in DSD Direct, I think this is DSD512
This is why I love recommending it
This is non inter harmonic multitone