Richard Moody wrote: >ps Anyone come up with something simpler? 1200*(log(F/f)/log(2)) Actually, this formula is for going from cps to cents. To go the other way, use: F = f * exp( c * log(2) / 1200 ) where f is a starting pitch in cps, c is the number of cents to change f, and F is the resulting new pitch in cps. exp() is the inverse of the log() function. In all these formulas it doesn't matter whether you use base 10 logarithms or natural (base "e") logarithms, so long as you are consistent. Bob Scott Ann Arbor, Michigan
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