New to PD and just joined the forum, great to be here :o)

My predicament is this: I want to write a patch for a sampler synth with pitch shifting without time stretching. This will be used in conjunction with a Critter and Guitari Organelle. From what I have seen, this is pretty straight forward to do with the phasor~ object via granular synthesis, however this causes the sample to loop. On the other hand, using the vline~ object allows for the sample to play on command without repetition but I can’t seem to figure out how to implement constant time.

I was wondering if anyone has figured out how to do a similar thing? Either using a phasor~ without repeats or constant time duration with vline~? Any help is appreciated :o)

If you have a working granular buffer player with phasor~, a non-looping version would delete the phasor and replace it with a line generator.

The phasor~ already normalizes the position within the buffer to the range 0 = beginning, 1 = end. The granular player then should already include the objects to convert that into a sample position. So as a starting point, your line~ / vline~ can simply go 0 to 1 and plug into the same normalized --> sample index logic. There may be some other refinements later, but start there.

hjh

if you mean pitch shifting with constant duration
3.audio.examples/I07.phase.vocoder.pd explains how to do this:
The [pd read-windows] sub patch within [pd fft-analysis] sub patch explains it more
here is a sample recording from a project I'm currently making using this
puredata.mp3

You can also check the audiolab library (available on deken; Help -> Find externals). It's a collection of vanilla abstractions. Its pitch shifter might be a bit CPU hungry as it is FFT based, but it's pretty good.