JACK is a low-latency sound server, allowing multiple applications to connect to one audio device, and to share audio between themselves. Many Professional-grade programs (such as Hydrogen and Ardour) on Ubuntu utilize JACK for maximum hardware compatibility and performance.

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What is the “buffer size” (audio) and how to choose the best amount of buffer size?

I'm learning about jack. There's something called the "buffer size" and is measured in samples. What is it and how to choose a good buffer size?
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1answer
283 views

Digitech USB multi-effect with Jack

I'm newbie in Ubuntu and I'm having a hard time to work with jack audio. I have started to use Ardour and the problem is the Jack server apparently does not recognize my digitech rp500 pedalboard ...
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1answer
883 views

Unable to install libjack-dev [duplicate]

I am on Ubuntu 14.04. 64-bit and I am trying to install linuxband. To do I need to install the package libjack-dev, but when I do so I obtain the following message: Some packages could not be ...
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2answers
321 views

Play audio on Ubuntu Core!

I installed Ubuntu Core 14.04 AMD 64. Now I want to play an audio! What exactly should be installed?! (I got this message on webkitgtk: jack server is not running or cannot be started) I got this by ...
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1answer
424 views

how to call using a synthetic voice in Skype

My goal is to use a synthetic voice in a Skype call. This could be used in a scenario such as being in two meetings at once (one local, one remote) and not being able to speak out loud (in the local ...
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1answer
599 views

Start jackd with realtime priority with upstart

I'm trying to start jackd with realtime priority at boot with an uptstart script but with no success so far. I'm using ubuntu server 14.04. My upstart version is 1.12.1. The user and group I'm using ...
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1answer
854 views

How do you get rosegarden to play sound when playing a midi in it?

How do you get rosegarden to play sound when playing a midi in it? Do I need Jack running?
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1answer
3k views

Audio interface: how to use it as a sound card

I just bought Focusrite Scarlett 2i2 since I heard good things about it, especially of its good Linux compatibility. I connected it with my computer via the USB cable and sent its line output to my ...
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1answer
2k views

how do I disable the headphone jack so sound will come out of the speakers?

I just installed ubuntu 12.04 (it still has windows 7 on it but I can't access it I don't think) on my moms older and pretty beat up laptop. the thing has a few problems like needing the keyboard ...
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1answer
167 views

Volume too low after connecting Pulseaudio to JACK

I followed the tutorial mentioned here but after the sound is much quieter even at 100%. I have loooked at the Pulseaudio volume controls and alsamixer and they are all also at 100.
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1answer
157 views

JACK turns off other sound

I have a midi keyboard connected to qSynth through jack, which works fine. But when I try to play other sound(from chrome, vlc, etc.) it is completely silent. How do I fix this?
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1answer
1k views

Output analogue audio (via speakers) through “line in” jack

...So I've been using Ubuntu for about 6 months now since I switched from Windows. I've been searching for one specific feature that was missing for Ubuntu... In Windows I used to connect my ...
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0answers
428 views

Several issues when trying to start jack server.

Configured or not starting jack server always results in this crash on my machine: JACK server starting in realtime mode with priority 10 ERROR: control open "/dev/audio" (No such file or directory) ...
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1answer
672 views

Audio over ethernet

I am not sure whether this is the right place for asking this question, but anyway I would like to give it a try. I want to transport audio over ethernet. I want to do a simple experiment with it. ...
2
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1answer
417 views

Convert TuxGuitar Drum Track to Addictive Drums

The scenario: Use TuxGuitar in Ubuntu 12.04 to Compose a Guitar Track and a Drum (Percussion) Track Practice song on Guitar while listening to TuxGuitar play the track(s) through the Gervill MIDI ...
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1answer
2k views

No sound from external speakers/headphones (jack)

I've got constant problem, after instaling Ubuntu 13.10. I get no sound from the audio jack (speakers, headphones etc) but my internal speakers work right, playing sound as they should. Tried many ...
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1answer
134 views

Multiple kernels choices realtime or no realtime

I have a dell latitude d510 currently running xubuntu 13.04 and linux 3.8. I want this machine to host JACK processes together with EDIROL UA-25 during a live session and therefore, it needs an RT ...
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1answer
281 views

Jack and webcam videorecording

Is there any means to record sound and video from the webcam and microphone while jack is operating? Cheese stops recording when I start jack. VLC can output in jack and apparently record sound ...
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1answer
1k views

switch audio output from PA to jack, breaks audio on google-chrome

I occasionally switch audio output from the ubuntu default pulse-audio to jack. this has created several problems that I haven't managed to fix in the past (no sound from firefox ever again, then ...
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1answer
626 views

Error using fluidsynth

I installed fluidsynth following the instructions here: http://sourceforge.net/apps/trac/fluidsynth/wiki/Download ...which were just sudo apt-get install fluidsynth But get the following error when ...
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4answers
3k views

No more sound after running Ardour

All the sound works perfect with all the applications on my system. But from the moment I launch Ardour, no more sound comes out from other application than Ardour. The easy way to get it back is to ...
4
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1answer
261 views

USB Audio card fails to initialize after turning it off and on again

I have a problem with an "E-MU Tracker Pre" USB audio card and Kubuntu. When I start the audio card for the first time since boot everything works fine, but after turning it off and on again, ...
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0answers
120 views

Uninstalled jackd* and sound doesn't work

I used apt-get remove jackd* and it removed all the following packages: fxcyberjack tuxguitar-jack libjackrabbit-java liquidsoap-plugin-jack slv2-jack qjackctl jackmeter jacktrip jack-capture ...
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2answers
9k views

How to do screencasting (desktop recording) with high quality audio and video?

I have googled around and found all the usual solutions. None of them work for me. First of all, I want to make high quality recordings. Second, I use JACK audio (PulseAudio is completely ...
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0answers
2k views

JACK error starting server using FireWire drivers

I've been trying to setup an Edirol FA-66 audio interface in Ubuntu 12.04 LTS, so that I can record sound coming from two microphones conected to it. The interface is connected to my computer using a ...
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2answers
2k views

jackd does not work, aplay -l shows two instances of the same card (Ubuntu 13.04, HDMI audio only)

I'm on Ubuntu 13.04, using a ZaReason Zini, which as far as I can tell has no audio output other than its hdmi port. I'm trying to get the Clojure library Overtone working, and ran into the problem ...
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1answer
621 views

13.04 hp laptop dv6t intel quad edition no headphone sound when plugged in

this is my alsa output http://www.alsa-project.org/db/?f=5dba3e3cc98914f6dce181eaa548769da5a0e6d8 I have followed this old solution that solved my problem for ubuntu 12.04, but in 13.04 the say ...
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1answer
864 views

jackd server will not start exit code 225

Could anybody explain the errors I am receiving using jackd with qjackctl 13:25:50.333 ALSA connection graph change. 13:26:11.822 JACK is starting... 13:26:11.822 /usr/bin/jackd -r -dalsa -dhw:2 ...
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3answers
681 views

Acoustic Guitar how can be connected to Ubuntu and make it sound like Electrical guitar to make metal sounds?

I have a Acoustic Guitar, which has audio output jack is there any way i can connect that jack to Ubuntu microphone in and then use some existing software which will make the Guitar sound like metal ...
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1answer
1k views

Python script to change the jack from input to output does not work in 13.04 [closed]

To change the jack from input to output for any computer or laptop I followed this question: How do I change which audio jacks are used for input and output? But the Python script does not work. ...
6
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1answer
13k views

Need external (usb)Sound card suggestions that work with Ubuntu 12.04

I don't know if this is the right place to ask about this, but I'll give it a try. I'm a linux user for a while now and I try to avoid opening Windows as much as possible. But for some things, I just ...
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1answer
492 views

How to use MIDI keyboard with seq24

I want to set some MIDI from a MIDI keyboard on a loop using a sequencer, and it seems like seq24 would be the simplest way to do this. However, seq24 doesn't show up in JACK connections, and I don't ...
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3answers
2k views

Playing a MIDI keyboard without JACK / how to use JACK and PulseAudio/ALSA

So, I havea MIDI keyboard but I'm not really motivated to play when I have to set up JACK and everything else just to get one sound out of it. The problem is that whenever I start JACK I can't play ...
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2answers
6k views

How do I switch between Pulseaudio and Jack on Ubuntu 12.04 LTS x86 Linux?

There are some applications on my Ubuntu 12.04 which requires Jack. Without Jack they just won't start, so I have to keep Jackd + (QjackCtl). Now the problem is jackd is not starting properly all the ...
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1answer
3k views

Unable to start jack server ? Service is available (org.jackaudio.service aka jackdbus).

Im trying to start jackd using QJackCtl but it fails with error messages Here is what I'm seeing - 14:36:48.194 Patchbay deactivated. 14:36:48.198 Statistics reset. 14:36:48.228 ALSA ...
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0answers
170 views

certain sounds don't work after I start JACK

I have ubuntu 12.10 on an acer aspire one 722 with ALSA & an ATI soundcard. So, i finally figured out how to start JACK; I type in jackd & qjackctl & jack_mixer and then open a new ...
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votes
2answers
3k views

Guitarix amp simulator “Failed to allocate memory” jackd

Has anyone any experience with Guitarix ? I have Jack set up and working well with Rakarrak but it wont work with Guitarix It tells me "could not allocate memory" dont understand why. Am I missing ...
0
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1answer
958 views

too many xruns in jack

I'm getting a lot of xruns in jack--about one every .5 seconds. I have been told that this is a very computer specific problem that could have a lot of causes. Is there anyone here who could advise me ...
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4answers
17k views

“JACK server could not be started” when using Qjackctl

I have a problem when I try to connect my guitar to my computer, via line input. Audacity works well, and I can record what I play on my guitar (selecting from Preferences from where to record to ...
3
votes
2answers
9k views

Jack Audio ubuntu 12.10

I used to have Jack Server working with 10.10, 11.04, 11.10 but not 12.04 and now 12.10. I have installed jackd jackd2 qjackctl surfed many forums and even given advice of how to get jack working, ...
0
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1answer
825 views

no sound zynaddsubfx and JACK wont run

I am trying to run zynaddsubfx. When I start from the command line, I get this: http://paste.ubuntu.com/1378693/ When I start JACK I get this: http://paste.ubuntu.com/1378694/
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1answer
413 views

Connect 4.1 speakers to Acer V3-571G with Ubuntu 12.10

I have the Acer Aspire V3-571G that has only 2 audio jack: 1 for headphone and 1 for microphone. Can I connect my Creative 4.1 speakers and have sound in all 5 channels? The problem is that speakers ...
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2answers
3k views

Using Jack audio and getting audio to play though headphones

I need to use Jack audio to prevent clicks but I'm having problems getting jack to play though my usb wireless g930 headphones. I'm using puredata and I can get my usb wireless g930 headphones to ...
0
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1answer
409 views

What changed with timidity, alsa and jack in 11.10?

I (just) upgraded from 11.4 to 11.10 and noticed some differences in the behavior of timidity. I used to (11.4) exectute >timidity midifile.midi without running jackd, and thus using alsa (or ...
2
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0answers
1k views

removing pulseaudio, moving to jack

I have installed jack because I want to use the LADSPA plugins available, in jackrack, for realtime audio processing. (I couldn't find any way to use them with pulseaudio) After much effort, I ...
5
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1answer
6k views

Unable to start jack (Cannot allocate memory)

I want to use PulseAudio on top of jack, so I've turned pulse off and now want to start jack using qjackctl. However, this results in the following error log: 22:14:15.933 Patch Panel disabled ...
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1answer
422 views

QJackCtl - Alsa Unknown driver

Here's my problem : I just have installed QJackCtl on my Ubuntu 12.04 and when I start Jack I got this issue : 12:01:22.769 /usr/local/bin/jackd -dalsa -dhw:0 -r44100 -p1024 -n3 -i1 -o2 Cannot ...
7
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2answers
16k views

Step-by-step to run a midi keyboard input device? 12.04

I have a Korg Nanokey, and I'd like to make it produce sound in ubuntu. I've read that means I should be using Rosegarden, and that Rosegarden uses JACK, but does not install it. (Although checking ...
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2answers
2k views

12.04 Ubuntu studio PREEMPT_RT kernel options

My audio processing needs require a preempt_rt kernel. I roughly followed the guide: https://wiki.ubuntu.com/KernelTeam/GitKernelBuild with a little help from: ...
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1answer
1k views

No sound on Rakarrack 6.0.1

I just installed Rakarrack and get no audio. I'm using Ubuntu 12.04 LTS. Help is appreciated.