Audio Testing
ASRock's audio designs have come a long way over the years, and new integrated audio ICs are pretty good too, but as they have gotten better, they have apparently also gotten a bit more sensitive to potential design issues. Fortunately, that's not the case here with the ASRock X399M Taichi, which manages a very impressive testing result with a very flat output.
RMAA results are below. Considering everything, this is one excellent result:
RightMark Audio Analyzer