Can you explain me the relation between note frequency and wire tuning? I see, for tuning violin, 440 hz is used and called an A4, while a 432 hz can also be used and that too called an A4. But, don't each note in an octave have a particular fixed frequency? What I am implying is, for example, if frequency of C in an octave (taking fouth octave) is X hz, be it I tune the wire to 432 hz or 440 hz, should the C's frequency still be fixed at X hz?
A = 440Hz has become close to a standard tuning pitch throughout several parts of the world. However, A, historically, has been several other pitches in different parts of the world, and is still not exactly 440Hz when one considers various orchestras' tuning in various locations.
However - as long as everyone who is playing together in a particular ensemble all uses the same datum point of A = xxxHz, then it will sound fine. Once that has been established, all other notes, C3, F4, G5 etc., will be automatically in tune with a properly tuned instrument.
I could, for example, tune my guitar down (or up) a bit or a lot, and as long as each string is in tune with the others, playing it in isolation , it'll sound in tune with itself. Should someone else want to play along as well, they would have to use the tuning that my guitar was in, otherwise it's going to sound awful ! This was one of the reasons A = 440Hz was chosen. It could have been 437, 448, and as long as everyone adheres, there's no problem