I just bought a new Steinberg UR22 MkII USB audio and it seem to work. But I ran a loopback measurement and the result had a fuzzy(thick) trace from about 18Khz to 20khz. I did try several sample rates 192k 96k 88k and 48k and they all exhibited a similar response. I have used other converters and not experienced this problem. Is this a fuction of the Steinburg?