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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No media play in any application after opening a DAW like Ardour or Qtractor

I'm a rather new Linux user, using Ubuntu Studio for about a month now. I've been having issues with audio and video playback not working in any application whenever I open Ardour or Qtractor. This ...
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18 views

Use webcam with PulseAudio while JACK is running?

I use JACK Audio Connection Kit with pulseaudio-module-jack so that all of my PulseAudio apps play sound through JACK. It works perfectly for 99% of my needs but I've found that JACK grabs my webcam ...
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80 views

Python script stopped working: Cannot autolaunch D-Bus without X11 $DISPLAY jack server is not running or cannot be started

I have a Python script on a Raspberry Pi that streams radio. It was working great for a long time, but today not so much. Here is a reproducible example that produces the error message: import pygst ...
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1answer
95 views

Red light from headphone jack Macbook Pro running Ubuntu 14.04

I'm getting a red light from the audio jack on a 2012 Macbook Pro. I'm running Ubuntu 14.04. Sound works fine, headphones or speakers, but whenever the sound is on the light comes on. It usually turns ...
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11 views

Using Jacks in Patchage

I just installed patchage, but My jacks (mic and headphones) are not showing up. Do I have to install some more package, to configure something with ALSA or pulseaudio ? Regards, FliiFe
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1answer
36 views

Overlapping system and Rakarrack playbacks on a X-Fi Gamer soundcard (setting up guitar)

I've gone through installick JACK and Rakarrack. I then had the problem with other audio (like YT flash videos or music player) disappearing when I turn on JACK etc., I've just installed pulseaudio ...
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398 views

Cannot connect to server socket err = No such file or directory when using QjackCtl

When I try to start a jack server I get these error messages and also a window pops up saying: Could not connect to JACK server as client. - Overall operation failed. ...
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1answer
49 views

JACK audio server stopping other media from playing

I've just installed ShowQ which requires a JACK audio server to output audio. I've got that working fine, however once I open ShowQ other audio sources will no longer play (youtube videos, online ...
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0answers
111 views

dssi-vst on 64 bit for use with Qtractor?

I'm wondering how to use Windows VST plugins with Qtractor, as I have yet to find VST instruments such as string sections and other orchestral instruments that are native to Linux. LMMS was good for ...
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26 views

What are possible reasons of regular sound glitches on recording with jack

I use jack connection kit (cadence with jackd) with my external USB audio card to record audio in Audacity. The problem is that regularly (about each 4-5 minutes of recording) a 'glitch' sound is ...
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1answer
78 views

No sound anymore on Ubuntu 14.04

I tried Renoise on Ubuntu 14.04, but it complained about Jackd and ALSA threads. I installed pulseaudio-module-jack and jackd hoping that it would help. It didn't. Instead I now lost all my sounds ...
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79 views

Pulseaudio doesn't work with Jack

At my wits end with Pulseaudio and Jack. I have followed every how to guide I can find, I've installed and reinstalled the Jack sink and source modules for PA and tried Qjackctl and Cadence. I am at ...
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247 views

How to configure qjackctl to combine output from mplayer and rakarrack? (“Audio device got stuck!”)

If I launch rakarrack (without jack qjackctl), I do get sound output to my speakers from the guitar input. However, if I try to launch mplayer, to be able to play along a song, it gives "Audio device ...
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111 views

Alsa modular synth doesn't start

I try to open ams. But it doesn't work. I installed jackd. But until now I don't know how to solve the problem. Do you need more information? Thanks in advance! Here is the error message. ...
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1answer
30 views

HP Pavilion dv6000: Jackd problem: (Ubuntu 10.04) I can't start Rakarrak, Mixx, Internet DJ Console and etc

I have Ubuntu 10.04 (I tried higer, but unity is lagging; yes it's Ubuntu 10.04, it's only theme) and I can't start Rakarrak, Mixx, Internet DJ Console and other programs for mixing songs. It's ...
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91 views

Play on Linux Audio Problem 14.04

For recording gameplay I use simple screen recorder and for audio I use jack and pulseaudio. My steam games default to my headset but to record I need it to go to jack sink. But when I go into Pulse ...
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76 views

Audio spikes to full power at random

I'm running Ubuntu 14.04.1LTS and I keep getting these annoying volume spikes at random. I'll be listening to something and the volume will spike to full blast. The only solution I've found is to ...
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1answer
162 views

Alsa ok, but no audio from Jack

So I run qjackctl and click start. It shows no errors, but there is no sound at all from any application. When I stop qjackctl it all starts working. I have no idea how to debug this :( Specs: HP ...
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1answer
1k views

How to use JACK and Pulseaudio/ALSA at the same time on the same audio device?

Whenever I launch hydrogen it breaks my audio in all other applications which use Pulse, for example, I can no longer play videos in Chrome after having launched Hydrogen once, until I restart my PC ...
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539 views

Increasing ALSA's buffer size

I'm trying to change ALSA's original buffer size, in order to increase it. Until now, I had no luck. I've tried to execute the commands listed in http://pastebin.com/4FibYN0U, however,I don't have ...
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1answer
139 views

Ubuntu Studio 14: Suddenly no sound from jack

My home studio setup was performing fine, when something crashed the jackdbus. I rebooted the computer, and now I can't hear anything from my system outputs. Capturing still works fine, and playback ...
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1answer
6k views

Problem starting JACK server “Jack Server is not running or cannot be started”

I am a professional pianist from New Delhi, India. I had always been a fan of Linux over Windows. Since I'm a musician, I downloaded some DAWs to try them out. I had read about JACK and that it helps ...
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108 views

update jack audio server package in ubuntustudio 14.04 from 1.9.9.5 to 1.9.10

can someone tell me how can I install jackd2 package in ubuntu studio 64bit 14.04? jack version 1.9.10 was publiced july 2014, so it was not part of ubuntu studio 14.04. I believe it is part of ...
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133 views

No volume control after joining PulseAudio with Jack

I have installed and configured jackd server following the Fedora's Integrating PulseAudio with JACK tutorial. The integration was successful. But now I'm not able to controll PulseAudio's volume ...
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60 views

Ardour 3 Jackdbus not quitting

Is there a solution to the problem of jackdbus not quitting after Ardour closes in Ubuntu 14.04LTS? I have seen other references to the problem but no solution. My workaround is to launch System ...
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1answer
50 views

cant compile audio software

I tried to install an audio software (SO-KL5 synth). My distro is Ubuntu 14.04 LTS. When I try to compile the software, it says it cant find jack and ALSA header files. Where are these files? Edit ...
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45 views

Jack not working with usb Microphone

I have a usb microphone that works with alsa but when I set it up for jack in Audacity nothing is being recorded I've tried each of the settings/options for the microphone in jack and both options in ...
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1answer
322 views

USB MIDI keyboard Akai LPK, jackd

I got Akai LPK25 and I am trying to make it working on my Ubuntu. I tried to follow a tutorial http://terokarvinen.com/2014/usb-midi-keyboard-on-linux-akai-lpk25-professional, but when I run ...
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0answers
1k views

How to avoid XRUN callback skips

After I set QjackCtrl and Arour, I can record fine, but XRUN callback skips are annoying. This is my QjackCtrl configuration: In logs I see: 18:37:22.041 XRUN callback (97). 18:37:22.793 XRUN ...
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1answer
116 views

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
201 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
425 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
252 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
320 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 ...
2
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1answer
404 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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2answers
565 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
2k 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
846 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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0answers
112 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
134 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
808 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
356 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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0answers
159 views

Headphone jack physically broken and that automute the speakers after about 1~2 minute [closed]

I have a annoying problem in my Asus X52F laptop running raring Ubuntu. My headphones jack had physically broken last mount and after this event the audio output automute after 1 to 2 minute of ...
2
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1answer
504 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
votes
1answer
356 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
118 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
212 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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0answers
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
528 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 ...