Linux-audio-dev November 2019

linux-audio-dev@lists.linuxaudio.org

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9 soundcards ?

by lacuna_＠gmx.net

4 years, 11 months

liquidsfz-0.1.0

by Stefan Westerfeld

liquidsfz-0.1.0 has been released The main goal of liquidsfz is to provide an SFZ sampler implementation library that is easy to integrate into other projects. A standalone jack client is also available. liquidsfz is implemented in C++ and licensed under the GNU LGPL version 2.1 or later. The release tarball can be downloaded here: https://github.com/swesterfeld/liquidsfz#releases -- Stefan Westerfeld, http://space.twc.de/~stefan

5 years, 1 month

Re: [LAD] Jack audio questions to aid in my development of audiorack

by Ethan Funk

Since I originally wrote audiorack using Apple's CoreAudio, I made design decisions based on the functioning of that API. Many of those choices needed to be reconsidered as I adapted the design to the jack API. A very big structural difference between the APIs is how "rendering" sample buffers is accomplished. CoreAudio provides a separate callback to get or deliver a block of samples for EVERY audio interface your program attachs to. For my program using that API, my design is based on an audio interface being choosen as a "master." This is the low latency interface that my code's core mixer is driven by. Other interfaces, both ins and outs, get an extra buffer between them and the core mixer. For the call-back code of these "slave" interfaces, my code compared the time stamps between the core mixer buffer, and the slave buffer to make a "phase" adjustment using Apple's varispeed resampling audiounit plugin with a PID error loop controlling the resampling ratio. This keeps the buffers, on average, in sync, but with extra delay to handle kernel callback scheduling jitter. i.e. no guarantee what order the OS will schedule the call-backs, even if they are on the same sample clock. So with this scheme, I could use any number of interfaces I wanted, each with it's own slightly different clock rates and drift, with one interface selected as the low latency master. After years of tweaking the PID filter, I had it working very well, with no cost (other than processor overhead of the re-sampling) to the master interface. Jack on, the other hand, has a single callback from which samples are received from jack source ports, and new sample data is delivered to jack destination ports. A very nice and clean approach, driven with a single clock source. And appropriate for interconnecting audio streams between programs. I like it a lot. I have lost the ability to allow for my software to handle re-sampling on multiple clock domains. I was thinking that zita-a2j, etc, was my path to get the functionality back. If I didn't have it working so well on OSX, I wouldn't lament the loss with jack. But it's hard to give up on it! Thanks for the Ubuntu Studio Control links. Ethan... On Sun, 2019-11-17 at 00:21 +0100, Ralf Mardorf wrote: > On Sat, 16 Nov 2019 15:49:34 -0700, Ethan Funk wrote: > > > Why do you need zita-a2j/j2a anyway ? Using a single > > > multichannelcardis usually the better solution. > > > > I have one multichannel audio interface for everything > > important:program out, studio monitors, headphones, guest mic, host > > mic,etc. But it sure is nice to be able to use the built-in audio > > for acue channel and talkback mic, where latency is not > > important. Alsohandy for USB turntables, and other random devices > > that areoccasionally used in a radio show without latency being > > important. > > You are mistaken. Try to avoid anything that affects > "everythingimportant". To sync different devices by software affects > "everythingimportant". > On Sat, 16 Nov 2019 14:47:26 -0700, Ethan Funk wrote: > > Does anyone know where I can find the source code for UbuntuStudio > > Control? > > https://packages.ubuntu.com/source/eoan/ubuntustudio-controls > https://launchpad.net/ubuntustudio-controls >

5 years, 2 months

Re: [LAD] Jack audio questions to aid in my development of audiorack

by Fons Adriaensen

On Sun, Nov 17, 2019 at 12:21:47AM +0100, Ralf Mardorf wrote: > You are mistaken. Try to avoid anything that affects "everything > important". To sync different devices by software affects "everything > important". It doesn't affect anything on the sound card that is directly controlled by Jack. From Jack's POV, a2j and j2a are nothing special, just regular clients. -- FA

5 years, 2 months

Berlin Linux Audio meeting @ c-base 2019-11-12

by Daniel Swärd

Hi. Tomorrow Tuesday it's again the Linux audio meeting at c-base in Berlin. See you there at 20. Cheers /Daniel

5 years, 2 months

Xmomk.lv2 initial release

by Hermann Meyer

I like to announce the initial release for Xmonk.lv2 version 0.1 Xmonk is a sound generator based on the Faust `SFFormantModelBP` from physmodels.lib by Mike Olsen. It's a monophonic formant/vocal synthesizer. The source is a sawtooth wave and the "filter" is a bank of resonant bandpass filters. Xmonk provide a interface to drive the filter/synthesizer via mouse movement. Additional Xmonk provide a midi in port to drive it with any midi controller. On top Xmonk provide a virtual keyboard to drive it with your PC keyboard/mouse combination. Surely you could use your DAW automation to drive it the way you want. Xmonk could play in two different modes, on is the usual note on/off, the other is sustain, means the last note play forever, while you play with the vowel filter settings. Xmonk could be used with a free scaled temperament, or as selected with Equal Tempered scales from 12 to 53. Here you get it: https://github.com/brummer10/Xmonk.lv2 So, have some fun with it, hemrann

5 years, 2 months

Work on linuxaudio.org this weekend

by Jeremy Jongepier

Dear all, This weekend the linuxaudio.org VM's will have to be moved to a different cloud region which could lead to some downtime of services provided by linuxaudio.org (i.e. mail and web sites). We'll try to keep impact as low as possible and are aiming at a seamless migration. This migration is necessary because the cloud region linuxaudio.org now lives in is being phased out. We'll keep you posted about the progress. Best regards, Jeremy

5 years, 2 months

[ANN] Qtractor 0.9.11 - The Mauerfall'30 Release

by Rui Nuno Capela

Hallo! Not making history or a revolution but as peaceful as thirty years ago ;) Qtractor 0.9.11 (mauerfall'30) is out! And the change-log goes as follows: - Transport/Backward commands now honoring edit-tail, loop-end and punch-out points, when playback is not rolling. - A session name (sub-)directory is now suggested on every new session properties dialog. - Avoid adding any extraneous clip replica when Ctrl+dragging on either of its edges. - When using autotools and ./configure --with-qt=..., it is also necessary to adjust the PKG_CONFIG_PATH environment variable (after a merge request by plcl aka. Pedro López-Cabanillas, while on qmidinet [8], thanks). - Fixing a potential crash-effect in switching MIDI output buses on tracks that are set to show audio output monitoring meters, is on going still. Description: Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: http://qtractor.org https://qtractor.sourceforge.io http://qtractor.sourceforge.net Project page: https://sourceforge.net/projects/qtractor Downloads: https://sourceforge.net/projects/qtractor/files - source tarball: https://download.sf.net/qtractor/qtractor-0.9.11.tar.gz - source package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.11-50.rncbc.suse.src.rpm - binary package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.11-50.rncbc.suse.x86_64.rpm - AppImage [7] package: https://download.sf.net/qtractor/qtractor-0.9.11-50.x86_64.AppImage Git repos: https://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor.git https://gitlab.com/rncbc/qtractor.git https://bitbucket.org/rncbc/qtractor.git Wiki (help wanted!): https://sourceforge.net/p/qtractor/wiki/ - static rendering: http://qtractor.org/doc http://qtractor.sourceforge.net/doc https://qtractor.sourceforge.io/doc - user manual & how-to's: https://download.sf.net/qtractor/qtractor-manual-and-howtos.epub https://download.sf.net/qtractor/qtractor-manual-and-howtos.pdf License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.org https://qtractor.sourceforge.io http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development https://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work https://linuxaudio.org [6] GPL - GNU General Public License https://www.gnu.org/copyleft/gpl.html [7] AppImage, Linux apps that run anywhere https://appimage.org/ [8] QmidiNet - A MIDI Network Gateway via UDP/IP Multicast https://qmidinet.sourceforge.io See also: https://www.rncbc.org/drupal/node/2054 Enjoy && Keep the fun. -- rncbc aka. Rui Nuno Capela

5 years, 2 months

Faster boot on Raspberry Pi 4

by Will Godfrey

I'm using rasbian-buster-lite and once up and running the performance is seriously impressive. However it's dog-slow to start up. The last message I see before the greatest delay (about 30 seconds) is: Raspberry Pi service to switch to ondemand cpu governor (unless shift key is pressed) during boot up. I suspect the *actual* delay is connected with networking, but with systemD I'm totally lost as to where everything is, so any help would be greatly appreciated. On the Pi 3 I'm able to get a devuan image, and that's a doddle to sort out, but there isn't an image for the Pi 4 :( -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

5 years, 2 months

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Linux-audio-dev November 2019