On Jul 6, 6:08 am, "N Cook" wrote:
For 5 octaves , for the "white" notes only , is the 15 th key from the left
middle C ? . Without any pitch-bend should it be 256 Hz or 256.?,262, 264 ?.
Or should the calibration be on "A" above middle C ie white key number 20 ?
and should that be exactly 440 Hz or some other frequency rounded to 440 Hz
?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

If you're working with an equally tempered scale, A above mid-C would
be 440Hz and middle C 261.625. The relation is 12th root of 2, approx
1.059. And yes, there are people who demand .01Hz or better accuracy.
Wikipedia is a good place to start.

http://en.wikipedia.org/wiki/Equal_temperament

GG