[PD-dev] dynamic patching - is iemguts the way to go?

[Nick Porcaro]

My setup is a JUCE app that uses libpd.  I load a patch that’s an effects chain,
with each effect in it’s own abstraction that can be switch~’d to zero so it does not
comsume processing when not in use.

The solution I have now is to rename the abstractions to reflect a new processing
order and then I reload the patch.  This works, but it’s a hack.  What’d really be
slick is if there was api in libpd for inspecting and editng a running patch.

The goal is to minimize glitches on reloading the patch.  We do a similar thing in 
GeoShred http://www,moforte.com <http://www,moforte.com/> in the effects chain.  We use Faust for the signal processing
in GeoShred.  There we essentially reorder a table of function pointers to accomplish the reordering.

- Nick


> On Aug 20, 2019, at 3:47 AM, Nick Porcaro <nick at ccrma.Stanford.EDU> wrote:
> 
> Hey Folks,
> 
> It’s been a while since I’ve done any hard core work with Pd but that time has come again,
> and I’m glad to be back on the scene!
> 
> In the project I’m working on I need to be able to reconfigure the processing order
> of  DSP objects in a given patch on the fly:
> 
> For example, from this: 
> 
> [noise~]
> [lop~]
> [hip~]
> [dac~’
> 
> To this: 
> 
> [noise~]
> [hip~]
> [lop~]
> [dac~]
> 
> Of course this is a trivial example, but it’s not if you wanted to arbitrarily reorder
> an effects chain with 30 objects in it.
> 
> I stumbled across this paper:
> 
> https://lac.linuxaudio.org/2009/cdm/Saturday/18_Zmoelnig/zmoelnig_pdreflection.pdf <https://lac.linuxaudio.org/2009/cdm/Saturday/18_Zmoelnig/zmoelnig_pdreflection.pdf>
> 
> and this GitHub repo https://github.com/iem-projects/pd-iemguts <https://github.com/iem-projects/pd-iemguts>
> 
> and it appears that iemguts might do what I need -
> 
> What do you all think?  
> 
> (I posted this to the patch~ section of the Pd forum as well, and there’s some discussion going on).
> 
> - Nick
> 
> 
> 
> 
> 
> 
> 
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