Re: [sc-users] Playback rate to semitones

[eirik.blekesaune@xxxxxxxxx]

Hi Kenneth!

You can think in terms of https://en.wikipedia.org/wiki/Pythagorean_tuning .

e.g. Major 2nd down = rate * 8/9

Perfect fifth up: rate * 3/2

Two Major 2nds up =  rate * 8/9 * 8/9 (which is equal to rate * 64/81 for major third)

+Eirik

On Wed, Jan 9, 2019 at 5:10 PM <kennethflak@xxxxxxxxxxxxxx> wrote:

Just got stumped trying to figure out a conversion between playback rate and semitones. Given that playing back a sample at a rate of 0.5 will transpose it down 12 semitones, and playing it back at 2 will transpose it up 12 st... How do I calculate arbitrary semitone transpositions up and down in terms of playback rates? My math part of the brain is apparently not working today. 

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