[PD] communication between pd-instances & midi synchronisation

Andrew Lyons tstexture at gmail.com
Wed Dec 18 18:50:38 CET 2019

I am also curious about communication between two Raspberry Pi's running PD.

It's not my intention to hijack your thread, but I'm wondering why you
didn't set up a looper in PD? Thanks!

On Wed, Dec 18, 2019, 3:25 AM Jakob Laue <jakkesprinter at web.de> wrote:

> Hi dear list,
> I have an eight-track-sample-player patch running on a raspberry pi. The
> sample player patch contains a metronome. This metronome does two things:
> 1) It acts as the instance that the eight sample tracks are synced to, in
> order to have the wav-files playing nicely in sync.
> 2) It sends out midi-clock data to an external hardware looper (856 for
> zellersasn) to keep it in sync as well.
> I am recording/looping audio coming out of the sample-player-patch with
> the hardware looper. All the syncronisation stuff works, but of course I
> have an unacceptable latency between the audio of the patch and the
> recorded audio on the looper. According to this thread..
> https://forum.pdpatchrepo.info/topic/4584/midi-latency-in-pd
> ..I think about splitting my metronome and my sample-playing into two
> instances of pd. One instance should contain the metronome with audio
> latency (=midi latency?!) set to a minimum and the other instance should
> contain the sample-playing-part. This way, the metronome-instance could
> send midi-clock to the looper with low latency. But it also has to send a
> clock signal to the other instance of pd, so that my eight samples keep on
> playing in sync. What would be the best way to send this latter clock
> signal from the "midi"-instance to the "audio"-instance of pd? Maybe osc?
> Or is there even a special [send] to share data between different instances
> of pd?
> Btw: I cannot set the audio latency in the "audio"-instance lower than 25
> msec, otherwise the audio starts popping and clicking.
> Thanks and all the best,
> Jakob
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