Jack alsa setup

Reboot system and login. Carla project should automatically open, then minimize itself. The five plus two seconds delay was added on purpose. If you load Carla too quickly, JACK audio server might not be up and running, therefore resulting in error loading your rack and patch bay. Logging in and out of the system might cause some issues with JACK server.

At this point, you should be up and running with a very basic JACK audio server setup. Please note that this is just a starting point. Feel free to experiment, tweak and adapt this tutorial to your needs. If you have specific support requests you can contact Ubuntu Studio team directly, through their support channels. If you enjoy this amazing distribution, please consider getting involved, purchasing some merchandise, or making a donation via Paypal or Patreon.

Watch this fun DestinationLinux podcast ! DLN Community:. Ubuntu Studio Mauro Gaspari December 3, Share on twitter. Share on facebook. Share on reddit. Share on linkedin. Share on email. Target Audience I made this tutorial for all Linux users.

PROs Easy to install and manage Jack audio server. Low latency audio. Low latency kernel, CPU governor, and other tweaks. Carla patch bay, rack, easy plugins and effects management.

Jack Sample Rate: This is hardware specific. Check your interface manual. Jack Buffer Size Latency : This is hardware specific. Start with Jack Periods: Also hardware specific. In the QASMixer settings, make sure both input and output devices are visible, enabled, and their volumes are at acceptable levels. These values override any system-wide defaults enabling unexpected behavior e. Refer to PulseAudio Configuration on how to update these configurations.

In order to prevent ALSA from messing around with your firewire devices you have to blacklist all firewire related kernel modules. This also prevents PulseAudio from using firewire. Create the following file:. The list of modules is the most recent available at the time of writing at Alsa Firewire Improve Repository. JACK can be configured to send audio data over a network to a "master" machine, which then outputs the audio to a physical device.

This can be useful to mix audio from a number of "slave" computers without requiring additional cables or hardware mixers, and keeping the audio path digital for as long as possible as hardware mixers with digital inputs are very rare. The configuration is very simple, however it requires a network that supports multicast traffic i.

For JACK2, the netmanager module must be loaded:. The -i -c option tells the netmanager to automatically map any incoming connections to the default audio device. Without this, each incoming connection would have to be manually mapped on each connection.

As soon you have done that, you can connect the MIDI device. See Realtime process management Configuring PAM and ensure that the user is in the realtime user group. In fact, this list is a rather good summary of the audio and MIDI applications that are available on Linux! Although not strictly part of ALSA utils, speaker-test is a quick way to make sure that the built-in Raspberry Pi audio output is properly connected and configured.

First, connect the RPi2 audio output to your powered monitors using a 3. The Raspberry Pi built-in audio can be routed to either the 3. Enter the command:. Once speaker output is working, why not play an audio file?

The aplay program plays an audio file. It supports just a handful of audio formats: voc, wav, raw or au. The default format is WAV. There are two ALSA utility mixer applications: amixer and alsamixer. Connect and share knowledge within a single location that is structured and easy to search. 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 or do sudo alsa force-reload.

Then configure qjackctl to run the following command after startup. Copy it into "Setup And that's it. When JACK is stopped Pulseaudio will revert to normal routing and start sending audio directly to card again. I just restarted the PC lazy, I know and it worked a treat So the system is reconfigured to use "Pulse on top of Jack". I skip hardware input suspend, because I don't use it anyway. The problem is Hydrogen as Ardour launch jackd at startup but don't close it at exit: But you can run killall jackd in a terminal after Hydrogen exit.

A complicated way to use Jack and pulseaudio software at the same time is to install "pulseaudio-module-jack" also install qjackctl gui for jackd and pavucontrol if not present. Restart pulseaudio pulseaudio -k. Now close audio apps Jack and pulseaudio , run jackd using qjackctl click start button dbus option must be selected in qjackctl settings last tab. In Pavucontrol "output device" tab, clic green "default device" button near "jack sink" Now pulseaudio software and Hydrogen should run at the same time.

Install pulseaudio-module-jack. Make sure jackdbus is started. Now start qjack and open your sound settings. Select it and all system will sync. It might be much easier now. What worked for me today, to satisfy my really basic needs, after a fresh install of Linux Mint Now I can play the keyboard while watching a video e.

A while ago I wrote a command, and someone reported me that after trying all solutions here he was out of luck. But this solution worked for him, so I'll post it here in case someone else can be helped.

NB: I'm not claiming this solution is the most elegant one, but it did the job quite well for me:. This solution may be slighly improved by unloading correctly the modules when quitting Jack, maybe using the ugly grep proposed here , but I didn't really found any benefit for me.

Click on Setup , and check that the output Interface is the correct one if you have an HDMI output for example this check may be important. In my case, I'll just use the default and I'll come back here if I've some issues later. Then, in the advanced tab, I replaced the Server Prefix jackd with pasuspender -- jackd. This is supposed to tell pulseaudio to temporarily let jack manage the sound card.

I'm not sure if it's really required, but I guess it cannot hurt:. Then, in the tab "Options", put in the Execute script after Startup the following code:.

The goal of this command is to create new outputs sink to pulseaudio that points to jack, to enable this new sink by default all newly open applications will write to jack , and it also change the output of all the existing applications to make sure they point to jack. Then, to make sure pulseaudio restarts when jack is closed, I also added in the field Execute script after Shutdown :.

That's it! Now, you just need to save by clicking on Apply and to click on Start to start jack:. You should see something like that if it works and of course no errors :. So basically, you can't play sound because only one program can play sound at the same time on the same sound card. So when Jack is playing, pulseaudio is blocked. Now, it also turns out that most desktop applications can talk to pulseaudio but not to Jack.