JACK Audio Connection Kit (or JACK; a recursive acronym) is a professional sound server daemon that provides real-time, low latency connections for both audio and MIDI data between applications that implement its API.

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9
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3answers
7k views

Jack vs Pulseaudio — how is it faster?

I see a bunch of claims that Jack is faster than Pulse and has less latency. How is that so? Why does Pulse call itself lightweight, and the Jack guys call it fat? Could anyone break down the ...
7
votes
1answer
5k views

Linux newbie: How do I use Jack? How does Linux sound work? [closed]

I am a Linux newbie. I know my way around the command-line enough to where it doesn't get in the way of my day job (I develop web applications in Python). This involves some piping, grep, awk, and ...
6
votes
1answer
794 views

Linux sound: how does it work and why do I need to chain 3 architectures to use JACK?

Linux newbie: How do I use Jack? How does Linux sound work? I have an app that is trying to output sound through ALSA or JACK, but I am not hearing anything. Here are a couple of articles, from ...
6
votes
1answer
4k views

Can someone diagnose this JACK error message?

OK. I start JACK without starting the JACK server. I get: 23:09:22.730 Patchbay deactivated. 23:09:22.765 Statistics reset. Cannot connect to server socket err = No such file or directory Cannot ...
5
votes
1answer
7k views

How to restart Alsa/PulseAudio after using Jack

After I use Jack, the PulseAudio outputs and inputs are replaced by a dummy device. I've tried to kill PulseAudio and reload Alsa, but the only way I can use an Alsa-based application again is to ...
3
votes
1answer
564 views

How to configure which sound card jack2 will use

I've installed jack2 as a substitution for jack from official repositories (I'm on Arch Linux): # pacman -S jack2 I need to use jack2 because it provides jackd (it's needed for another application),...
3
votes
1answer
3k views

Live noise cancellation of microphone audio with JACK, ALSA, Audacity?

Audacity has a very nice noise cancellation filter. Is it possible, using JACK with ALSA, to pipe live audio through Audacity's noise cancellation filter?
3
votes
1answer
3k views

Alsa & JACK - card and device names (different naming conventions)

I am a bit confused about audio device names. If I use command aplay -l i get the list of all audio devices on my system: **** List of PLAYBACK Hardware Devices **** card 0: NVidia [HDA NVidia], ...
3
votes
2answers
1k views

Is there a linux distro that uses Jack audio server all the time?

By this I mean a distro that does not use pulse audio at all. So when you are runing programs like miro or mumbles you do not lose audio playback becuase Jack took over the audio stack.
3
votes
1answer
1k views

Issues with ardour and jackd

I'm trying to play with ardour. When I started it up, it complained that jackd isn't running, so I ran jackd -d alsa, which displayed: jackdmp 1.9.6 Copyright 2001-2005 Paul Davis and others. ...
2
votes
1answer
1k views

Espeak showing some warnings and Input output error

I am running espeak on Linux Mint 14. Whenever I try to run it, it shows following warnings ( Not errors as it works correctly ). ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm....
2
votes
1answer
2k views

How to turn microphone jack to headphones jack?

I've picked out my headphones jack. Can i change my microphone jack to headphones jack only by soundsystem configuration? My soundcard is Intel82801I (ICH9 Family) HD.
2
votes
1answer
86 views

Pipe output of jack_cpu_load through sed

In the shell, when I pipe jack_cpu_load through sed, or cut, no matter what options I use it stops printing just before the lines I want to see. jack_cpu_load | sed -n 8p will print: Jack: ...
2
votes
1answer
2k views

Help configuring DBUS to start JACK

I have the Jack Audio Connection Kit (JACK) installed, but cannot seem to get jack_control start to start the service. I'm using Slackware64-current, which recently updated its /etc/dbus-1/system....
2
votes
0answers
109 views

jackd and SuperCollider headless problem

I am trying to boot an RPi autonomously to start jackd, SuperCollider and then play a SuperCollider patch. Jack launches and Supercomputer starts to compile but then something goes wrong. The script ...
2
votes
0answers
227 views

alsa sound module snd_aloop

I am having some trouble wrapping my head around the snd_aloop module. I am trying to route all my audio through alsa without using pulseaudio. If I start jackd there's not sound from non alsa apps ...
2
votes
1answer
100 views

Possible race condition when scripting headphone plug-in event

I'm currently trying to script the headphone plug-in/out event. I found out that I can script this quite easily as an acpi event.. I created a file in /etc/acpi/events/ with the event event=jack[ /]...
2
votes
0answers
320 views

pavucontrol: Connection to PulseAudio failed

After uninstalling JACK I lost my access to PulseAudio Volume Control. It says: I tried purging and reinstalling pulseaudio and pavucontrol and removing ~/.pulse-cookie and ~/.pulse. Also, I tried ...
2
votes
1answer
308 views

JACK can't play ardour along with any other media

I recently downloaded Ardour2, and it appears that JACK cannot run Ardour along with any other media (Rhythmbox, YouTube, Pandora, etc.). The symptoms are as follows: If Ardour is the first thing I ...
2
votes
0answers
295 views

JACK issues on Lubuntu, any thoughts? “Driver is not running”

I am trying to set up JACK and Wine to run FL Studio on Lubuntu. Upon running qjackctl and attempting to start JACK, I get the following error. Any thoughts? I disabled JACK D-Bus and got fewer ...
2
votes
0answers
119 views

Configuring jackd (JACK daemon) with ALSA

I'm trying to wrap my head around ALSA config files and jackd, but I'm not getting anywhere, other than crashing my machine. The microphone is a USB type and specified in ALSA arecord as -D plughw:1,...
1
vote
1answer
57 views

linux audio feedback

I am using jackd and pulseaudio with the pulseaudio-jack-module so that I can have pulseaudio and jack running at the same time. I mostly use jack applications, except for web browsing and a few other ...
1
vote
1answer
380 views

What are XRuns?

I have read about them several times and encounter them myself when setting the buffer size too low in jack or quitting audio applications. Nobody ever explains though what XRuns are. Can someone ...
1
vote
1answer
168 views

Plug dmix into JACK

There are several guides of how to use JACK with ALSA dmix plugin, like this and this. All of them suggest to route the JACK output through dmix, which causes a latency to the jackified programs. To ...
1
vote
1answer
198 views

Jack not recognizing MIDI device

Jack does not recognize my MIDI keyboard, whereas ALSA does. Here are the logs : pi@raspberrypi / $ jack_lsp system:playback_1 system:playback_2 LinuxSampler:midi_in_0 LinuxSampler:0 ...
1
vote
0answers
27 views

Configuring a system to run PulseAudio automatically on top of JACK

This is essentially the same as the Ask Ubuntu question How to use JACK and Pulseaudio/ALSA at the same time on the same audio device?. However, the answers to that question are all incomplete in at ...
1
vote
0answers
48 views

Treat multiple sound input sources as one virtual microphone

I want to automate my home using Jasper. To do that, the documentation tells me to edit the ALSA config file so a usb card will have index 0. I want to use multiple microphones spread around my house....
1
vote
0answers
32 views

recordMyDesktop can't use jackd for audio

If I try to have recordMyDesktop (technically qt-recordMyDesktop) capture audio via jackd, when I hit record it immediately stops with the message: recordMyDesktop has exited with status: 4352 ...
1
vote
0answers
199 views

USB Audio detected by ALSA but not JACK?

I have a Presonus AudioBox USB device, connected to a USB 3 port, that supports both MIDI and Audio input. When I launch JACK and open the connection list from QJackCtl, I can see that the AudioBox ...
1
vote
0answers
336 views

USB MIDI keyboard (Oxygen 61) now not appearing in QJackCtl

I've had a USB Oxygen61 MIDI keyboard for awhile now, and it has worked fine in the past (maybe a month ago, last I tried). But now when I plug it in, it no longer shows up in aconnect -l, and I can'...
1
vote
0answers
22 views

How to join the two input streams of a multidevice soundcard?

I have an old M-Audio Blackbox that consists of two sub-devices. If I open qjackctl those are advertised as hw:Box,0 and hw:Box,1. Up to now I readily switched between those configurations as needed, ...
1
vote
0answers
64 views

How can I stub out an audio interface in jack?

I've got a Tascam US-800 8-in/4-out audio interface that I use to record into Ardour. The setup is great, but I like to do my mastering and mixdowns elsewhere and I always have to drag around the ...
1
vote
1answer
229 views

Losing (realtime) permission when sudoing from root to myself

After an upgrade to debian wheezy (I did not upgrade the kernel - it is still 3.8.2) I can no longer start jackd in the way I used to do it. I get you are not allowed to use realtime scheduling. My ...
1
vote
0answers
40 views

Starting jackd after using other audio

I know this is probably a common question. When I start jackd after first booting, everything works fine. If I use another audio (such as Banshee or Youtube, etc) jack won't start. From what I gather,...
0
votes
2answers
897 views

What Linux distro is good for music and well supported?

I'm pretty disappointed with Ubuntu. It's never been easy to sort out the mess that is Alsa / Jack / whatever and have it work with Pd, Supercollider, Ardour, Lillypad. I've upgraded to the latest ...
0
votes
1answer
99 views

Jack and Raspberry Pi

Attempting to write some small midi programs with rtmidi on my Raspberry PI (Debian Wheezy). But, when I compile it, g++ cannot find jack/jack.h. However, when I run sudo apt-get install jackd it ...
0
votes
1answer
143 views

AmSynth 1.5.1 with jack and alsa (JACK init failed: error: could not open ALSA MIDI interface)

I built and compiled amSynth 1.5.1 from source. I then started qjackctl and ran amsynth from command line, but it produced the following error. JACK init failed: error: could not open ALSA MIDI ...
0
votes
0answers
20 views

Unable to start jack server in beaglebone black debian [duplicate]

I am trying to build run a C program in Beaglebone Black using Debian in which I am trying to receive sound from USB sound card. For this I have made my USB sound card as default sound hardware by ...
0
votes
0answers
44 views

USB sound card not working properly in Beaglebone black

I am trying to use USB sound card as default in beaglebone black using Debian. For this I disable on board sound hardware by adding this line optargs=capemgr.disable_partno=BB-BONELT-HDMI in /boot/...
0
votes
0answers
39 views

Multiple sound errors when running Pyo

I just tried to install the python module with pyo following this method: http://ajaxsoundstudio.com/pyodoc/compiling.html it returned this error: pyo version 0.7.8 (uses single precision) ALSA lib ...
0
votes
0answers
91 views

espeak, alsa Unknown PCM

I have a Debian Wheezy and I connected to my linux a USB Dac. I use every time a MPD server (and that work) Now, I would like to use espeak with pyttsx But when I start my script (It worked and my ...
0
votes
0answers
30 views

Is it safe to retask other audio ports as lineins using Jack?

So, I wanted to setup my Linux PC to record multiple line in audio devices without putting holes in my wallet. Then I found a tool called hdajackretask which lets me convert any port into any other ...
0
votes
1answer
13 views

How can software that doesn't natively support JACK be made to work with it?

Audacity, for example, can be switched to JACK if needed. What about software that can't but can be switched to alsa?
0
votes
0answers
51 views

Can't start Jack as simple user

I'm trying for weeks to create an evoluted webradio based on Jack (Pulseaudio sucks for what we need). Jack is running well when I run it as root and jack_lsp is well returning what i'm looking for. ...
0
votes
0answers
347 views

No sound with audio jack

I am using a Debian wheezy on Netbook eeepc 1001px After last kernel update When I plug the audio jack, I can here the electric charge but no sound when I remove it the internal speaker works ...