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pitch_percentages_for_semitones_and_notes

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# Relative pitch percentage & semitone note table

(This is useful if you're making a controller act similar to the Vestax Controller One.)

Note name Semitones Pitch percentage
A -12 = 1 octave -50%
Bb -11 -46.83%
B -10 -43.70%
C -9 -40.43%
Db -8 -36.77%
D -7 -33.20%
Eb -6 -29.05%
E -5 -24.95%
F -4 -20.41%
Gb -3 -15.67%
G -2 -10.58%
Ab -1 -5.48%
A - 440Hz 0 0.00%
A# 1 +6%
B 2 +12%
C 3 +18.1%
C# 4 +26.3%
D 5 +33.8%
D# 6 +41.6%
E 7 +50.6%
F 8 +59%
F# 9 +68.8%
G 10 +79.5%
G# 11 +89.5%
A 12 = 1 octave +100%

There is some margin of error here as I derived this using an electric keyboard which had some vibrato, but it's close enough for DJing use.

Note: the exact values can be calculated fairly easily with a spreadsheet. Since an octave doubles (or halves) the frequency and there are 12 equal steps (semitones), we can find that the frequency is multiplied (or divided) by a certain factor

mfact = 12th root of 2 = 2^(1/12) = 1.0594631

So you get

 A 440Hz A# 440*1.059 = 466.2 Hz B 440*(1.059*1.059) = 493.9 Hz

etc.. 