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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73 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 ...
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44 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 ...
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13 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, ...
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23 views

Why does qjackctl come up with gray windows, no GUI?

I ran qjackctl a while ago. The window came up gray, no GUI controls. I tried killing it, and using xkill. It went away, but ps still shows qjackctl. About fifteen of them! For I had attempted to ...
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95 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 ...
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1answer
42 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 ...
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42 views

JACK pitch shifting

I like to play along with songs coming from firefox on my MIDI keyboard, so I have Pulseaudio routed through JACK as detailed here. But a lot of the time, especially in older recordings, the pitch ...
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4k 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 ...
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1answer
51 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 ...
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1answer
117 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 ...
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1answer
109 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 ...
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1answer
294 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 ...
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164 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 ...
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1answer
2k 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], ...
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1answer
69 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: ...
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1answer
2k 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?
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1answer
4k 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 ...
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54 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 ...
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1answer
159 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 ...
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1answer
551 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 ...
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105 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 ...
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1answer
3k 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 ...
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1answer
988 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 ...
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33 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 ...
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2answers
759 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 ...
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1answer
3k 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 ...
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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. ...
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2answers
974 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.
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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.
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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 ...