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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12 views

Can't get sound from midi keyboard

I have an AKAI-LPK25 and want to connect it to ZynAddSubFx (which i downloaded from sofwarecenter). I run the Qjackctl and connect Zynaddsubfx output to system, clicking on the keys of Zyn works fine ...
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11 views

Good audio mixer for Jack Audio Connection Kit

Does anyone know of a good audio mixer for JACK? I just need it to monitor my sound, maybe change bass, treble, or maybe use a equalizer. I am looking for something similar to Voicemeeter. Thanks ...
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12 views

System wide audio compression for video out to TV

My main issues is watching movies hooked up to my tv from my laptop. Unfortunately my laptop is older, and only has VGA out, so I need to use the headphone jack to the back of TV. The dialogue is way ...
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44 views

Recording through an M-Audio Fasttrack Pro into Ardour with Qjackctl - No Input Signal?

Update: linuxaudio states that the M-Audio Fast Track Pro can only work at 16 bit due to USB 1.1. http://wiki.linuxaudio.org/hw/m-audio_fast_track_pro What does that mean to get it up and running? ...
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15 views

Jack Audio doesn't work after standby

I have a computer set up as an audio editing/mastering workstation. It draws a lot of power during idle, so I really prefer to put it into standby when I'm not using it; however, when I put it into ...
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17 views

jack: cannot get any sound (MacBook)

I've been trying to get sound out of Rosegarden, ChucK and FaustLive and Jack for hours, and I just can't. I'm using Ubuntu 15.10. Here's what I've done: Add myself to audio group (and re-log ...
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8 views

How to setup JACK and PulseAudio to work at the same time but in different outputs

I have been reading about JACK audio because I want to test Rosegarden. In the way I saw this : Telling JACK which device to use To tell JACK to use the RME Hammerfall DSP, you would typically ...
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16 views

Control knobs of Qsynth using a Novation Launchkey Mini

I'm using a Novation Launchkey Mini as a Midi controller connected to Qsynth (GUI for FluidSynth) with Qjack, which at the same time is using a Focusrite Scarlett Solo as its audio interface. It all ...
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1answer
21 views

When musescore is open (using jack), how to videos from YouTube either are paused or have no sound

When using musescore, I'm trying to follow how-to videos found on YouTube. However, I find that when musescore is open, videos are paused or there is no sound. As soon as I turn off musescore, video ...
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1answer
25 views

How to connect a MIDI Keyboard and automatically write notes?

I need to create a sheet while I play. How do I do this best? I want to just play the song and my PC does the rest, so I just need to print/play afterwards.
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1answer
175 views

Focusrite Scarlett 6i6 hard times

The answers to this question that are all around the forums already outdated. I'm running a clean install of Ubuntu Studio 15.10. With Jack Control or aplay -l I can see it's there. But I can get no ...
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60 views

ChucK creating no sound

I am new to Chuck, but the whole idea, especially the on-the-fly modification of the code, fascinates me. Unfortunately I can't make it run on my Ubuntu OS. I use pulseaudio for my sounds and ...
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1answer
84 views

JACK breaks audio. How do I fix it?

Audio was working fine until I tried to use qjackctl and qsynth to play a MIDI keyboard. I followed this answer* to setup the keyboard and it worked. But then I noticed other applications couldn't ...
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30 views

Do Iceweasel or Chromium browsers directly support JACK audio?

I found nothing while googling for JACK audio support of Chromium and Iceweasel. Still, I wanted to ask the question here in case I missed something. Thanks.
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46 views

How to set up Jack + Alsa to show, by name, all ports on sound card

I know I could probably find what I'm looking for by going through a ton of documentation, but hopefully I can find a concise answer here that more directly explains what I'm trying to figure out. I ...
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0answers
27 views

64bit jackd with 32bit clients

Is it possible to use 64bit Jack Sound Server with 32bit applications like Wine, vsthost, Renoise? I'm trying to use this configuration but I got no sound and midi.
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22 views

Connecting to Jackd server

I'm not sure how I'm meant to set this up. I have the qjackctl GUI installed and I have used the following settings - Before starting the server from the following GUI - I can hear a song ...
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40 views

Ubuntu 14.04 LTS 64bits - Jacktrip - Is it possible to install librtaudio4v5 or do I need 15.10

I was trying to use jacktrip, a software which allows to transfer audio streams over the internet so to perform music remotely. https://github.com/jcacerec/jacktrip Unfortunately, I realized that ...
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1answer
361 views

How to get to a perfect jackd configuration that works trouble-free and out of the box?

While working on a PPA to provide binaries for Sonic Pi, the users of the PPA binaries keep stumbling over jackd. How to make things easier for them? Sonic Pi is an educational music tool that ...
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92 views

Ubuntu & Ardour + jack

I've been trying to figure out how PulseAudio works with Jack, but I can't seem to find it. I've always used Fedora so I didn't have this issue. I install qjacktctl and Ardour4, but when I link ...
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2answers
142 views

Distorted sound from headphone jack Ubuntu 14.04.1 LTS

I am reaching out for a help to diagnose and to fix the problem I am having on my Ubuntu box. The OS: Linux 3.16.0-51-generic #69~14.04.1-Ubuntu x86_64 GNU/Linux Desktop with default Unity Desktop ...
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22 views

connecting jack muse and zynaddsubfx

I can get sound from zynaddsubfx through its Jack connection. However I can not get the pianoroll in muse to connect to Jack. I have looked at YouTube tutorials, etc. I connected, I think, Zyn to ...
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37 views

How can I properly use both Alsa and Jack?

I installed Ubuntu, and everything was working fine. Then I installed Jack to record music and interface with my MIDI keyboard. Then I ended up in the weird situation where I could hear my synth and ...
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1answer
341 views

USB Audio Interface not showing device in list for Pulseaudio

There are a lot of questions around this, I must have gone though about 10 to see what's wrong. I have a Behringer FCA610 usb audio interface that I use as my primary card. In Ubuntu 14.10, I simply ...
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44 views

Set up jack2 server on ubuntu 15

I'm trying to make my lmms 1.1.3 installaton work with jack2, but I have no idea which packages I should install and what should configure to make it work. I've tried to install jackd2 and qjckctl ...
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1answer
17 views

QJackCtrl Activate Patchbay persistence

I am trying to use Patchbay persistence with QJackCtrl to help manage my connections. However when I go to try and activate it it doesn't seem to create a file for me (for the settings). I also can't ...
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1answer
178 views

jack2: error while loading shared libraries: libjackserver.so.0

I'm running 14.04 64-bit. I downloaded the source tarball file (1.9.10) for jack2, unzipped it and then cd'd to the root directory. sudo apt-get install libsamplerate0-dev sudo apt-get install ...
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170 views

JACK and PulseAudio multiple sinks

I successfully configured PulseAudio to run ontop of JACK by following this surprisingly easy description. Now I wonder if there is a way (at first I was certain of it) to have multiple sinks between ...
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77 views

JACK Audio muting Speakers but not playing through Headphones

I successfully configured PulseAudio to run ontop of JACK by following this surprisingly easy description. Now I only struggle to use my headphones. As PulseAudio would do until now, when inserting ...
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0answers
43 views

Using JACK Audio Kit I get feedback (echo and reduced volume) when I start the server

Greetings and Thank you - I installed Jack2 hoping to get Rivendell to actually play. after a lot of hours I have Jack running (started via the GUI) and can see the connections in the connection ...
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43 views

Jack audio how to loop back multiple USB sound cards

I started using JAck audio a day ago and I want to know how to loop back multiple USB sound cards with some c code. I am unable to find a server program in the examples because it runs as a server ...
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1answer
257 views

“Jack audio server could not be started” in QJackCtl

I have been trying to start the JACK audio server in QJackCtl, but I get the message: DBUS: Jack server could not be started. Sorry So the symptoms of my problem are exactly the same as in this ...
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1answer
60 views

Wine Installation conflict with Ardour / Jack

i tried to install wine via the software center (version wine1.6 1:1.6.2-0ubuntu4) and console. In both cases wine wants to uninstall Ardour, Jack, Rosegarden and a few more. How can i install wine ...
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1answer
34 views

How to do advanced MIDI keyboard routing?

I want to replicate a specific model of e-piano on my MIDI keyboard. To do this, I must send white keys to one synth application, and black keys to shift down half a tone and send to another synth. I ...
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75 views

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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57 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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313 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
370 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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2answers
590 views

How do I route an USB Audio Interface (MBox2) to a DAW (Qtractor) via Jack or Patchage as an audio channel?

I'm borrowing an Mbox2 Mini and want to play around with this in Ubuntu 15.10 with gnome. In with jack, I can see it as a MIDI device: However, I can not see it as an audio input device: My ...
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1answer
69 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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1k 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
94 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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0answers
407 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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1answer
38 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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145 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
243 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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5answers
6k 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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0answers
1k 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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2answers
276 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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2answers
14k 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 ...