[BeniBoy]

I learned about that in the Paul Franklin online course (expensive, but worth the money if you are unable to find a personnal teacher, yay europe). I don't have absolute pitch (and a crappy relative one), but this "standardisation" based on the root note really helps build a knowledge of how chord changes "feel". I suspect this is what builds this ability to easily find the right notes when improvising. Weel anyway, always happy to find people keeping the steel alive !