Spin Semiconductor

Does anyoıne knows how to calculate the semitones value for pitch chance ,I multiplied the the pots value by 2 from the main program (main program is for 4 semitones originally) to get 8 semitones the value of the pitch width is increased but I got different pitch change .I try to make vocader, with using diffrent values for fixed semitones.Otherwise whats the proportioın for pitch change...

Please see the pdf at http://www.spinsemi.com/Products/appnot ... N-0001.pdf
It has the equation for calculating octave shift so you can simply adjust for semitones to calculate the required coefficient.

Hi ,Me again.Thanks for the information.But there is one problem for me.I dont know How to calculate the 2^N . for 1 octave its too easy 2^1 =2, but for 5/12 octave 2^5/12 or for 7/12 octave or for 11/12 octave.My math knowledge is not enough also I could find nothing about these kind of examples at maths pages...

I just use a calculator for those kinds of calculations or use a spreadsheet like Excel.

For something like: X=A^(B/C), you can break it apart like:

F=A^(1/C)
X=F^B

So, you need things like 2^(5/12) or 2^(7/12)

2^(1/12) = 1.059463094

2^(5/12) = 1.059463094^5 = 1.334839854

2^(7/12) = 1.059463094^7 = 1.498307077