Interesting stuff. I am a K-03 owner using strictly physical discs, but have been investigating PC sourced audio for a long time. Unfortunately for me, I have been paralyzed by analysis and confusion, as the world of dsd, double dsd, PCM, etc has rendered me brain dead lol. Even the new world of FPGA dacs, which of course I have no idea what the acronym means but it supposedly renders the transport immaterial, adds more confusion. In any event, I digress. Jon2020, what kind of PC do you use, and how do you download music? Do you burn discs into your PC? Does your new method of copying music to USB flash drive render the quality of the original PC used to copy/store music immaterial to SQ?