Looks like you were thanking folks and wrapping up the conversation. I want to reiterate what I commented earlier and you included in several of your points taken from the discussion. It's not easy putting into words. A person with real perfect pitch does not have a set of tuning forks in their head that specify " these are the correct pitches and anything else is wrong." If they grew up with C at 261 Hz then they likely "learned" that pitch was C and therefore think anything else is incorrect. If they grew up hearing it as 254 then they will likely think that is correct. Again, there is nothing innate in the brain that specifies one pitch as correct or another as incorrect. That would be learned. So, when a player is playing a440 but grew up in Germany typically tuning to A443, they feel the a440 is flat. Purely learned. Also pardon earlier post where I notice I said Cis440. Should have said 261 hz (and that is even slightly flat :) - hey it's been 45 years. The point being there is not any right or wrong, other than what we define as a pitch. A person with perfect pitch may learn a certain pitch as their reference for correct, be able to continually reproduce it, so think other pitches are off.