Dear @ct0517 : Thank's. I could think that atmasphere knews exactly what I refered to, but....???
I can add to your post: inverse RIAA eq too, disortions/resonances/vibrations developed in between cartridge ridding LP modulations then the developed resonances developed by the TT/tonearm feedback. LP playback process is a " nigthmare " but even that sounds good.
R.