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// Calculate how many percent a frequency changes when a vibrato of a certain "cent" (of a semitone - that's the technical term they use) is applied. // From: https://en.wikipedia.org/wiki/Vibrato // "The extent of vibrato for solo singers is usually less than a semitone (100 cents) either side of the note" // => cent = 100 // "while singers in a choir typically use narrower vibrato with an extent of less than a tenth of a semitone (10 cents) either side" // => cent = 10 // "Wind and bowed instruments generally use vibratos with an extent of less than half a semitone either side." // => cent = 50 static double vibratoCentToFrequencyPercentage(double cent) { ret (plusOneSemitone()-1)*cent; }