I would chalk that up to the debate over LP vs. CD. It is in that article I referenced, too. In best conditions, some cannot tell one source from the other, yet others notice spot on. I think it's a debate that will never die. It's probably part of the reason people are tempted to spend an enormous amount on turntables, not to mention stylus and cartridge, trying to capture that perfect sound. I have heard the best played on the best and with all of those 'bests' with a tube amp and exceptional speakers can send you (can me, anyway) into another world that Dolby, in my opinion, still tries to capture. Audio is a lot of fun! I thank God every day for good hearing and good audio equipment, next to air conditioning, which in the south, is one of God's greatest gifts to man. Back to compression. If you take the program, Adobe Audition and play with compression, one can hear vastly different results with the same passage at different ratios. For all I have played with it in different situations, my best guess would be that compression is the reason. The wrong one chosen can even take away the style out of an instrument or a voice as well as enhance it with correct settings. But, I have found that compression comes at a price for not everything becomes the focus, and some sounds are almost hidden, or exploded and a nuisance is now a distinction. But I don't have individual tracks to play with and since Chris explained that some sounds were grouped, this all could possible make sense.