Holy moly! I downloaded the free sampler from HD Tracks and I am listening to the 24bit/96kHz .FLAC files right now. The sound is so pristine, natural, and full along with being totally relaxed and effortless! My Resolution Audio Opus 21 Extra Sources box has a USB 2.0 port, but it uses the older adaptive mode so I am limited to 24bit/96kHz source material. These few HD Tracks sampler .FLAC loss less files sound absolutely wonderful compared to the rest of my music library which is almost exclusively 16bit/44.1kHz source material. It is a very big and easily noticeable sound difference! There is so much more fidelity, clarity, dynamic range, resolution, and detail along with a holographic sound stage. Female and male vocals take on a natural tone and pitch which sounds effortless. This is unbelievable!
Now, if only I can figure out how to re-download the Head-Fi sampler album without having to repay for the same data twice. I sent HD Tracks a message and I am waiting for their reply to my question.