A:432 vs. A:440

The biggest problem with representing sound frequencies in "hertz" is that it is based off of the time unit of the "second". Who knows the real reason why the aliens who gave the sexagesimal system to humanity did so? And so, although in hertz A432 works out with apparently more mathematical harmony, remember it is only harmony relative to the unit of the second which may be a completely disharmonic measurement of time relative to the cosmos.

I do however agree with the notion that there are frequencies that certainly resonate more with human consciousness and the body.

Perhaps there are fundamental frequencies and ratios that resonate with the very fabric of the universe itself- particularly the part of the universe that is the human body. For example, atoms, molecules, cells, water, electrons, rate of natural heartbeat and breathing, brain states etc.

To tap into this, we need to create a time system based off of these features, which includes more resonant, natural numbers of nature, like Pi or Phi for example.

We also need to compute the natural attributes of air itself as a conductor of sound waves-and include temperature and moisture factors, as well as the strings and instruments one is playing. Everything needs to "sync up" perfectly. This is perhaps why old intsruments sound better after being played so long. They have in essence been entrained to resonate with the player and with itself.

The chromatic scale is also a pretty "rough" representation of natural ratios. You just can't break a seamless spectrum like a rainbow up into 12 colors. Expert piano tuners are aware of this and always encounter dissonances. An ideal scale would have only graduations that are resonant and harmonious.

And so, all this being said, perhaps a=432 just happens to come close to or land on a few of these ideal natural frequencies relative to the chromatic scale, and sounds better to some. Or maybe some are so programmed with the sexagesimal interval of the "second" that it lines up more harmonically for them. But I feel that an A = 427 to 430 lands on more of these "feel good" tones than other chromatic scale tunings.