I have had the great honor of working on numerous occasions with baroque orchestras and instruments, including baroque strings, oboes, flutes, and - most exciting of all - violas da gamba. Baroque pitch was often much lower than modern pitch. Common modern practice with baroque instruments is to tune to A 415 but according to this post, baroque pitch ranged from 392 (!) to 465 (!!!).
http://pbosf.blogspot.com/2010/01/story ... pitch.html" onclick="window.open(this.href);return false;
But... I have worked with gamba consort and asked them what pitch they used and they said 440. I never noticed. So I don't think it matters very much, really, but hey, why not 432? It may relax you but it'll drive everyone with perfect pitch at 440 completely crazy!
That said, the standard impression that string players give me is that the lower pitch reference is more grateful sounding - richer, warmer - than the modern standard. I have sometimes convinced myself that is true but in reality I have not noticed much difference. Certainly A432 would not make much difference at all, certainly not emotionally. There is a tendency for tighter (higher) strings to sound brighter; I have been told that is why modern orchestras have adjusted the tuning up from 440, in order to project better in large modern halls. Possibly another reason is that a tighter string enables more precise execution of certain effects, like jete (rapid bow bouncing).
There is a book which I have to get when I have a spare 80 bucks called The Story of A which is all about the history of performing pitch.
http://www.amazon.com/History-Performin ... 0810841851" onclick="window.open(this.href);return false;
The real issue is not pitch level but intonation. This has barely been addressed in modern synthesis/sampling, at least not in a prominent way. In fact, aside from auto-tune (of all products!), does anyone know of any reasonably common piece of gear that lets you quickly change the tuning from equal tempered (ugh!!) to mean tone (mmmm...), just intonation, or some of the other groovy intonations that have been invented over the years, like Partch's 43 tones to the octave? I can't think of any, but then maybe I don't know some of my instruments that well. I do know that Ivory has a stretch tuning feature (good), but does Kontakt, EW, Vienna?