In the other side neither R.Gandy Rega designer said that. Rega designer said that cartridge alignment and VTA ( between other set up parameters ) are " aproximations " ( you can read in the Rega tonearm manual. ) and he is rigth but he did not said anywhere that VTA/SRA changes does not " affect " the sound quality we are listening.
Yes, we can't match exactly the cartridge ridding stylus tip with the groove LP modulations do that we need it not mm. VTA/SRA changes but cms. that precludes to do it.
The other problem is the totally LP imperfections that impedes accurazy in the cartridge/tonearm set up.
RG said " aproximmations " and in the case of pivoted tonearm designs the geometry alignment is exactly that way because always exist a tracking error that we can't avoid it.
In the case of VTA/SRA ( RG said is: futile distress about. ) it's the same for different reasons than the alignment regards.
VTA/SRA changes at each single LP groove do to micro-waves that we can't even seen/ca'n detect. Exist no single truly flat LP surface at micro level that's where the cartridge stylus tip works.
Even that and that we can't match the LP grooves by VTA/SRA changes these VTA/SRA changes makes a difference in the quality sound we are listening and only a deaf person can't detect it and I'm totally sure that RG is not deaf. He said that " VTA is a Neurosis not a technical adjustment ". To each his own.
I respect his opinion but I know he is wrong as you been a follower of him in this regards. Of course that if the changes in VTA/SRA are " minute " ones we can't detect it but all depends on the quality level of the tonearm, cartridge and set up along the home room/system resolution levels.
Btw, it is weird that RG does not gives to much importance to the cartridge/tonearm overall set up when in his own Rega recordings he takes care in deep at each single link on that recording proccess from the microphones selections and position passing for the micro electronics mixing that he designed and builded and self modifications in the recording R2R he uses. He is way demanding of quality there and I know because I own some of his recordings where comes all the explanation detail how that recording was made it.
Btw, I found a gentleman through the net that posted :
"
I have spoken to Roy Gandi a few times on the phone. He does have very definite ideas on what a TT should and should not do. Equally I have spoken to Tom Fletcher (Nottingham) on the phone. He too has very definite ideas on all things TT. Both are respected manufacturers and both have a very dedicated following. Generally they agree on the big picture but not on the details.
From what I have seen adjustment of VTA is not merely a case of how close you get to the angle of the cutting head. It is more about optimizing the balance of arm and cantilever to ensure the diamond rides optimally in the groove.
I think most people will agree that there can be quite dramatic changes in the musical presentation....... "
the key there is: optimizing the balance of arm and cantilever to ensure the diamond/stylus tip optimally in the groove... "
That's the best we can approach ( " optimally " with unavoidable restrictions. ), yes faraway from precise but that's all we can do and makes a difference.
That's LP analog.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.