Hi,

I need to know how to subdivide the speed (pitch) of a sample to correspond to a normal note scale...i try to divide from 0 to 2 in 12° but i don't know if it's right.

I have a sample player that have 0 to 1 (normal speed) and to 2 (max speed).

There's a general rule to do this ? i know that the sample itself has it's note but i need a way to subdivide it like a keyboard with tone and semi tones..

Thanks in advance

One way to do it (i'm sure there are others) is to choose say middle C (C4) to be standard rate playback (ie. 1).
C4 = midinote number 60 = 261.626 Hz

So, taking the frequency of an incoming midi note and divide by the base frequency that you want to be normal playback:

[notein]
|
[mtof]
|
[/ 261.626]
|
feed the result of this into your phasor or whatever...

Or just use the [mtosr] abstraction from flatspace if you are using PDx! (bugger i hate it when that happens!) NOTE you will have to normalize the output of this to scale properly...

thanks,

I'll try in this day...i'm new in pd but i think that i can do it.

you could try [expr $f1 * (pow (2, ($f2 / 12)))] - see attached patch (it's just using an [osc~] object, but the idea is the same. You can change the 12 in the formula to 1200 to get cents instead of semitones.

http://www.pdpatchrepo.info/hurleur/semi-tone_calculation.pd