[PD] first trial,. but no sound

Stefan Thomas kontrapunktstefan at gmail.com
Thu Jul 5 17:42:38 CEST 2012

Dear Kaj,
thanks for Your help.
I've installed the lowlatency kernel and I've also reinstalled qjackctl and
pd, from the ubuntu repositorys.
But I still do have the problem, that I don't hear any sound.
I opened Your patch signal-example and I can see the "cables".
But I can't hear any sound!
I don't have the option "compute" audio.
When I click DSP, nothing happens.
Shall I install a newer or older version from source?

2012/7/4 Kaj Ailomaa <kaj.ailomaa at mousike.me>

> On Wed, 2012-07-04 at 08:20 +0200, Stefan Thomas wrote:
> > Dear Iain,
> > I did as You suggested, the problem remains the same.
> > One problem might be:
> > When I reinstall PD some of the other PD-related packages will be
> > reinstalled to.
> > But I've read in the meantime, that my problem could be a bug, related
> > to my version of PD.
> > It seems to be the same problem like the one, I have read on this
> > site:
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=645041
> >
> Yep. It seems to be a bug with that release.
> I've added an example as an attachment. Should be enough to check if
> everything works.
> Alsa works for me, but it doesn't work well at lower latencies. Jack is
> preferred for that.
> Only, to get lower latencies with jack, you'll need to install
> linux-lowlatency (low latency capable linux kernel) and set up realtime
> privilege (all this is done if you installed Ubuntu Studio).
> To set up realtime privilege, you'll need to do a few things.
> First, install linux-lowlatency: sudo apt-get install linux-lowlatency
> Second, you need to answer yes when asked about this when installing
> jack. If unsure, see that the file /etc/security/limits.d/audio.conf is
> not named /etc/security/limits.d/audio.conf.disabled. To rename it, do
> this in a terminal:
> sudo mv /etc/security/limits.d/audio.conf.disabled
> /etc/security/limits.d/audio.conf
> Inside that file, you need to have these two lines uncommented (they
> should be by default):
> @audio   -  rtprio     95
> @audio   -  memlock    unlimited
> If the file doesn't exist, just create it: sudo nano
> /etc/security/limits.d/audio.conf
> ..and add the two lines above.
> The third thing to do is to add yourself to audio group: sudo usermod -a
> -G audio $USER
> Then, reboot.
> Latency is adjusted separately for both jack and pd. I believe jack
> handles audio latency when used with pd, while pd handles its' internal
> data latency.
> Good latency for me is 64 frames/period in qjackctl settings, and around
> 5-10 ms in pd jack settings.
> |----------------
>   kaj.ailomaa at mousike.me
>      ---------------------|
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