Hi everyone,
I’m currently working on a small granular patch and trying to make it properly stereo.

Right now I have two separate arrays — samplebufL and samplebufR — and two corresponding tabread4~ objects that feed throw~ busL and throw~ busR.
However, I still only hear sound from the left channel.

granular2.pd grainvoice.pd

It seems that both tabread4~ objects are not being driven independently, or maybe my right buffer isn’t being read correctly.

I’ve attached the two files:

granular2.pd (main patch)

grainvoice.pd (the subpatch that handles each grain)

Could someone please take a look and tell me what’s missing to make the granulator output true stereo?

Any help or advice on the best structure for a stereo granular patch in Pd would be greatly appreciated!

Thanks a lot in advance 🙏
Emiliano

@avenir I think you might have uploaded the wrong patches. I only see one array called "source-array" and only one mono tabread4~ object.

@jameslo Hi! Thanks for checking the patches.
The files I uploaded are actually correct — at the moment the granular patch is mono because it uses only one array called source-array and one tabread4~.

Now I’d like to make it stereo.
My idea is to duplicate the existing array and the corresponding tabread4~ object, so that I have:

samplebufL
samplebufR

Then I can load two channels (or two mono files extracted from a stereo file) and route them to throw~ busL and throw~ busR, or directly to [dac~ 1 2].

Could you please confirm if this is the right approach?
Basically, I just want to extend the current mono version to stereo — the logic should remain the same, only duplicated for left and right.

@jameslo sorry I made a mistake because I wanted to load the one with the two arrays already ready, my fault

@avenir said:

My idea is to duplicate the existing array and the corresponding tabread4~ object

Yep, that's the right approach. [soundfiler] can fill the left and right channel tables in one call, and if you want, you could also specify left and right tables for a single tabread4~ object, and then the output would be a 2 channel snake (see [snake~]).

@jameslo said:

My idea is to duplicate the existing array and the corresponding tabread4~ object

Yep, that's the right approach. [soundfiler] can fill the left and right channel tables in one call, and if you want, you could also specify left and right tables for a single tabread4~ object, and then the output would be a 2 channel snake (see [snake~]).

so I can simply duplicate the tabread~, assign the name of the second array, and use snake~ — one inlet and two outlets going to dac~, correct?

thanks in advance

@avenir No, you can duplicate the tabread4~ objects each with its own table, or you can use one tabread4~ object and specify 2 tables to read from, in which case the output of tabread4~ is a snake. Look at tabread4~ help and click on the multichannel support subpatch.

@jameslo

thank you so much, I’ve fixed it

@jameslo
thanks a lot for your help — although I’ve actually already used the multichannel setup with snake~, and building this patch is kind of driving me crazy
I’ve just integrated it! If you’re curious, you can check out the project here: https://www.peamarte.it/env/envion_v3.6.html

thanks again:)

@avenir FYI, you know how you are applying the grain envelope to the output of snake~, 1 for each channel? You could also just apply it to the snake once and it affects both channels. That's the point of snake~--to help reduce uninteresting duplication.

@jameslo said:

Per tua informazione, sai come applichi il grain envelope all'output di snake~, 1 per canale? Potresti anche applicarlo a snake una sola volta, in modo che abbia effetto su entrambi i canali. È proprio questo lo scopo di snake~: ridurre le duplicazioni inutili.

left one is correct, right? so the grains on the right are basically passing through without being enveloped, right?

@avenir Look! I know Italian!

Here's what I mean. All the connections in the shaded area are 2 channel snakes, so you only have to multiply, throw~, and catch~ once. But the other way works too.

@jameslo ahah fantatsico, ma ti conosco forse anche da discord? o forse no, Comunque grazie:)