Hi,

I'm just getting started with Pd on Fedora Core 3; installation was pretty painless thanks to the CCRMA repositories, but I've run into an issue when I first tried to make some sounds with Pd. I recreated Miller Puckette's example of a constant amplitude scaler. When I start the audio, the signal seems to take a few seconds to 'settle' into a constant frequency; I get a few seconds of static that eventually turns into the sine wave I was expecting. When I click the DIO errors button, I get a bunch of A/D/A sync errors, as follows:

audio I/O error history:
seconds ago error type
0.73 A/D/A sync
0.73 A/D/A sync
0.75 A/D/A sync
0.94 A/D/A sync
0.94 A/D/A sync
0.95 A/D/A sync
1.01 A/D/A sync
1.01 A/D/A sync
1.10 A/D/A sync
1.10 A/D/A sync
1.11 A/D/A sync
1.11 A/D/A sync
1.17 A/D/A sync
1.17 A/D/A sync
1.17 A/D/A sync
1.17 A/D/A sync
1.27 A/D/A sync
1.31 A/D/A sync
1.31 A/D/A sync
1.36 A/D/A sync

If I let the steady sine wave tone continue, eventually there's a bit of a 'hiccup' in the sound, and then I get the following errors:

audio I/O error history:
seconds ago error type
1.25 DAC blocked
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late
1.25 data late

Can anyone help me out in diagnosing this problem and fixing it? Where should I start looking to fix this?

Thanks!

Hi

As far I as know it is usually a latancy problem. Try media/Audio settings and increase the delay. I really depends on your soundcard how low you can change this and whether or not you run pd through jack, but try and experiment with a few different settings. 50 is usually a good 'safe' number.

Having a high latency can be a real pain though as it will make respons times slower and real-time manipulation very hard.

I still get a few sync errors, but it's not so bad that I can't live with it. And the planet has a whole section about how to optimize your fedora box for the lowest latency.
[url=http://ccrma.stanford.edu/planetccrma/software/ ]http://ccrma.stanford.edu/planetccrma/software/

Hope this was helpful.

I 've the same error with DEMUDI 1.2.0, I'm fighting it during 1 week, but ...

a lot of audio clics , shit sounds !!
my DIO errors messages :



I've tried the see this problem into linux forums, I've just found this :
http://lists.puredata.info/pipermail/pd-list/2001-02/001757.html

Someone say that we have to change SETUP in JACK, don't use realtime, use "jackd" instead of "jackstart", maybe change PEriods/Buffer to 4. But always this shit sounds !

So someone says that it's a problem of version of pure data, because I haven't this sound in other audio application like freeebirth. May be I've to reinstall a ubuntu linux ditribution and install pure data from internet, the newest stable version. So which version is OK?

so an so long ....

We say to me that it's a problem of pure data version which is pd 0.37.1 devel in the DEMUDI 1.2.0 distribution.

So
I did : apt-get update + apt-get install pure data
I've now the pd 0.38.4 version.

WITH JACK :
I've changed the Period/Buffer to 4, the XRUNS callback are not so many now ... It's softer.

When i launch pd in the work space number 1 (It's KDE Xserver graphic), the sound is interrupted a lot of time, and when I go to the next workspace (with pd on the first one) the sound is smoother.

WITH ALSA:
The sound is interrupted less but it's the same shit sound. when I select the next workspace, I've A CORRECT FINE SOUND !

Is it a proble of KDE, ALSA or pd ?

And in the both case when the mouse scroll over a windows, it CLICKS !

SO ? could you help me ?