Volume is "fixed", so no issue there (Sonos volume is 24 bit, and therefore not critical anyway). My "reburn" test tells me that there is nothing wrong with the files themselves. It's the method of retrieving data that is the matter here, not the data itself. At least it seems so. But as I said, I have absolutely no idea why it sounds different. And I really want it to sound the same!

Current M-related equipment: DSP7000 (2), G91A FM, Sonos ZP90/ZP80 Zone Players, F80 (kitchen,yellow).