[LAU] issues with Pure Data and JACK

Peter P. peterparker at fastmail.com
Mon May 18 21:35:08 UTC 2015

Hi Robert,

* Robert Edge <thumbknucklerocks at gmail.com> [2015-05-18 09:52]:
> I'm having problems with Pure Data and JACK and I was wondering if anyone
> else has seen this behavior.
> I can have any number of JACK applications happily running and routing
> audio back and forth, when I start PD I often (but not always) get a
> crackly distortion.  This distortion is present is on any JACK client,
> before PD has even loaded a patch or is actually processing audio.  Closing
> PD does not solve the problem,. I need to close every JACK client, close
> jackd, and restart the server.

I remotely remember something similar a while ago on one of my boxes,
yet not sure if i had gotten the same error messages as you. But I had
to restart my jack server as well (and hence all clients that were
connected to it).

Somehow I ended up setting jackd's priority to 89 (using the qjackctl
GUI). Not sure if it was due to that error or for other reasons.

Try using pd -rt -jack (realtime priority in Pd) and ask on the Pd
mailing list as well: http://lists.puredata.info/pipermail/pd-list/

best, P

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