Inna, I've got a tweaked out rig that includes things like: Incognito Tone Arm Rewire, "Deluxe Groove Tracer Subplatter", and other stuff,plus Grado Sonata cartridge, perfectly installed.
I recorded before and after the improvements; therefore I was cognizant of every minute difference, including "nuance" of old favorite records.
My "Geek" explained the process to me, and it was similar to the process used in "Star Trek" when they get beamed up; the molecular breakdown and regeneration. Although he explained it to me, I couldn't even explain it to myself; nevertheless, it works.
Although the before and after the tweaks is quite apparent, there is absolutely no difference between listening to the music on computer playback, and spinning a record.
I know this is true on my rig, I just wondered if it was the same on others rigs. I know I made some improvements on my computer, but I forgot what they were. If improvements are necessary to get this level of playback, you can inquire the same people who responded to my post.
Enjoy the music.