[PD] mc – multichannel extension for Pd

Winfried Ritsch ritsch at iem.at
Thu Dec 9 09:41:12 CET 2021

Am Sonntag, 5. Dezember 2021, 17:22:44 CET schrieb Thomas Grill:
> Hi all,
> i'd like to make you aware of an abstraction library i have made because of
> working more with multi-channel loudspeaker systems lately.
> Dealing with many parallel signal connections was cumbersome, so i have come
> up with the mc library in order to abstract multi-channel processing. It
> consists of pure-Pd abstractions using dynamic object creation and it is
> NOT related or compatible with the similarly named Max approach. I hope
> there are no similar libraries out yet, i have not come across anything
> related.
There was an discussion 2013 on a workshop with Miller on the IEM and a 
solution was proposed:

"Pd-snake was an idea 2013 within a workshop with Miller Puckette at the IEM 
to extend Pd with multichannel signal connection, which is backwards 
compatible, but has not been implemented yet."

The main idea (trick) was to hold an parallel info about a signal which 
multichannel or not... to be upward compatible and add some multichannel 
natives object to collect and distribute.

In the meantime I did a sime multichannel objects for Ambisonics and other 
purposes as abstraction library only, using dynamic patching and used it in 
some projects (mainly Auditory Environments) until today:

- https://git.iem.at/pd/acre-amb

mfg winfried

> Please check it out at
> https://github.com/grrrr/mc <https://github.com/grrrr/mc>
> It is definitely not more than alpha quality and currently has only basic
> functionality (as much as i have needed so far). But i'd like to put it out
> to the public since i don't know how much i will be able to work on it, and
> i'd like to hear about your feedback and suggestions for further
> functionality.
> There are rough edges, for example message boxes popping up when closing
> patches with dynamic modifications, but i am not sure to which extent these
> effects can be handled on the patcher level.
> A technical note:
> The connection logic works both on signal and message connections (the
> latter over send/receive). In principle message-only would be possible, but
> signals seem to be necessary for the correct ordering of the message graph.
> Right now the same information is sent on signals (2 integer numbers per
> vector: ID and channel count) and messages. There is definitely a lot to
> optimize, maybe the signal connections can be dummy, without any
> information sent at all. However, the connection logic overhead seems to be
> absolutely negligible compared to the DSP load.
> Please let me know what you think.
> best, Thomas
> --
> Thomas Grill
> http://grrrr.org <http://grrrr.org/>

- ao.Univ.Prof. DI Winfried Ritsch 
- ritsch at iem.at - http://iem.at/ritsch
- Institut fuer Elektronische Musik und Akustik
- University of Music and Dramatic Art Graz
- Tel. ++43-316-389-3510 (3170) Fax ++43-316-389-3171 

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