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(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%|
|A - 440Hz||0||0.00%|
|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#||440*1.059 = 466.2 Hz|
|B||440*(1.059*1.059) = 493.9 Hz|