Hallo team
I am currently dissecting a very nice spectral delay external --
https://guitarextended.wordpress.com/2012/02/07/spectral-delay-effect-for-guitar-with-pure-data/ -- and I would like to know if any PD veterans here can point me to a transparent and comprehenisve tutorial on using abstractions in PD, and parsing Array data in a polyphonic context.

I am asking because I am a little unclear about how/when an abstraction becomes 'polyphonic' in PD. I can pass single data streams to a lower level abstraction, yet I cannot see how PD 'knows' if a given abstraction is polyphonic, requiring a $0 prefix, parsing etc.
(Coming from Max, I expect to declare voice-numbers, voice-targets, pack/unpack etc)
Pointers very much welcomed friends (PD-vanilla, with cyclone and zexy libraries)

Brendan

ps, I have been here -- http://www.pd-tutorial.com/english/ch03s08.html -- as part of my studies, but it lacks a transparent discussion on polyphony, voice-targeting and Array data parsing

@brendanmac In your Pd installation folder......
Pd\doc\7.stuff\synth\1.poly.synth.pd
If you want to use samples then you will need to replace the [synthvoice] (synthvoice.pd in the same folder) with an appropriate sample player.
David.

You should also explore the [clone] object, which is built specifically for polyphony. It's new to Vanilla 0.47, so you won't find it mentioned in most of the tutorials.

Hi
thanks for the quick response, I'll investigate it now. My question may well be a bit vague though I'm afraid: in the example external, there is an abstraction (Guitar_specdelay~). Within that abstraction there is some GUI stuff (Canvas, I think I've sussed this bit out), that is exposed in the main patch. Drawing on the Arrays passes a list of values (64 items I think), which is parsed via $0-gain (for eample). This much I think is clear to me. However, I can't see how or where PD is 'told' how many iterations of the abstractions are required, or how the Array data is parsed.

But I'll have a look at the example patch you recommend and report back

Many thanks
Brendan

@liamG oooh, the plot thickens, thanks

Sorry to be a pain

If you have the time, glance at the example I posted (wordpress link), there is clearly some sophisticated polyphonic parsing going on, and I'm too old/tired/etc to dissect it. It's a pretty simple patch.

Here are two patches, which illustrate my understanding of sending GUI data to a lower level abstraction. Where I become confused is, all this $0- stuff

gainTest_MAIN.pd

gainTest~.pd

@brendanmac I see you are still working on it....... I am off to bed, but.......

$0 is a unique number assigned to the patch that contains it when the patch is opened by Pd.
It is a high number.... greater than 1000...... so as to (hopefully) keep it unique.
It is also of the same value in a sub-patch of that abstraction......

But in another patch, or even another copy of the same abstraction, it will be different..... in fact it will be the value assigned in the previous patch opened... +1....... but don't try to be too clever and rely on that...... you will get caught out for sure!
It allows you to keep abstractions unique in their internal workings, even though they are copies of exactly the same patch....

It is a bit fiendishly difficult at first.
I tried, not succeeding very well maybe, to explain it here........show_me_dollars.zip
Then open "show_me_dollars.pd"

David