Hi I have a granular patch, where I am calculating the pitch using the following expression

pow(2,($f1/1)-1) *(44100 /4096)

Where 44100 is sample rate and 4096 is window size.

The default pitch is therefore 1 = 10.76

The question is I want to scale the pitch in semitones, my math being a little shoddy to say the least I was wondering whether anyone could suggest any pointers?

for a start, [mtof] makes the scaling much easier, as each midi number step represents one semitone, and therefore 12 midi number steps is one octave.
middle C, well...there's never been a clear standard for if it's C3, C4, or C5, but i always take midi note #60, as that seems the most common. and Midi note 60 has a frequency of 261.626 hz

So, if your default pitch is a C, at midi note #60, and the 'pitch' of that in your granular system is 10.76, then here's how to shift the pitch:

[(pitch inlet)]
|
[+ 60]
|
[mtof]
|
[/ 261.626]
|

• If you do that, and send a 0 to the inlet, you get natural pitch. a value of 1 will raise the pitch 1 semitone. -1 lowers it one semitone. 12 will do an octave shift etc.,.,

Many thanks for that perfect!