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#1 2015-05-28 17:13:48

al1979
Member
From: Cheshire (UK)
Registered: 2011-08-22
Posts: 10

Crackly sound on jack using internal soundcard

Hi I just bought a quad core pc to do music making on. Before that I was using ubuntu on a 2.40 ghz dual core processor. This one is quad core 3.90 ghz. Good news : i am using my presonus audiobox 1818vsl via jack with MusE and the audio is not skipping or crackling.

Problem:

When I use jack on the pcs internal soundcard even with 1024 frames per period. The audio is crackling.

Please can anyone help me to stop this problem?

Where do I start ?

Do I need extra ram ?
(Ive got 4 gb at the mo)

Should I look at the bios?

Are there any crunchbang optimum settings I should be using?

Would updating the kernel or anything else help?

Many Thanks.


O:)

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Be excellent to each other!

#2 2015-05-28 17:42:17

twoion
Emerald Caffeine
From: 星界
Registered: 2012-05-11
Posts: 1,648

Re: Crackly sound on jack using internal soundcard

Do you hear distortions when playing audio through plain ALSA (NO jack, NO pulseaudio)?


Tannhäuser ~ {www,pkg,ddl}.bunsenlabs.org/{gitlog,repoidx}

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#3 2015-05-30 09:29:36

ohnonot
...again
Registered: 2012-05-22
Posts: 2,205

Re: Crackly sound on jack using internal soundcard

so you're talking about jackaudio?
this problem sounds familiar from the few times i've been using jackaudio. it's a question of finding the right settings for your system. there's the standard gui utility, qjack...something, you have to play with it.
or find some better advice on linuxmusicians or linuxaudio.

but of course you should make sure if it's jack or alsa related.
oh, and keeping pulseaudio running while using jackaudio can be tricky, i have heard somewhere.

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#4 2015-05-31 02:15:39

tknomanzr
#! Die Hard
From: Heavener, OK
Registered: 2014-12-09
Posts: 777

Re: Crackly sound on jack using internal soundcard

If you are running stock Crunchbang, then you are using pulseaudio. There are some suggestions on these forums regarding removing it and getting back to a straight Alsa setup.

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#5 2015-06-05 07:03:21

ohnonot
...again
Registered: 2012-05-22
Posts: 2,205

Re: Crackly sound on jack using internal soundcard

@tknomanzr: i think you missed the reference to jackaudio in op's first post (it is often referred to as "jack" which i find confusing because it refers to a piece of hardware).
afaik, it is possible to use jackaudio AND pulseaudio (but not for the faint-hearted to set up).
so, @al1979, tknomanzr's advice is probably still the best to start with.

Last edited by ohnonot (2015-06-05 07:04:19)

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#6 2015-06-05 09:53:52

unfugr
#! Member
From: ruhr area, germany
Registered: 2012-09-18
Posts: 68

Re: Crackly sound on jack using internal soundcard

Stock crunchbang waldorf uses Kernel 3.2someting.
If I remember correctly then doing pro audio things with a vanilla debian kernel and an internal audio device is not a setup that wins you a cake. It's like riding a bicycle on a motorway or something.

Is the linux-image-rt- still around for 3.2 ?
The realtime patches do help a lot.

As far as I know, L.P. built in a switch that shuts down pulseaudio if the jack server is started but I don't know if that switch is in the version in waldorf.

You really should not need more ram. 4gb is ... well... much.
Simplified: You need more ram to increase the number of audio tracks, everything else is cpu.

Are all power saving things off?

Do you have cpufrequtils installed (You really want the performance governor).
Search term: cpu frequency scaling

Last edited by unfugr (2015-06-05 10:28:16)

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