Linux-audio-dev September 2019

linux-audio-dev@lists.linuxaudio.org

16 participants
10 discussions

Xputty - damn tiny abstraction Layer to create X11 window/widgets with cairo surfaces

by Hermann Meyer

For creating LV2 UI's I end up more and more writing the same code, so I decided to wrote a Layer for it. It's supposed to create, manage, draw, and destroy X11 widgets with a cairo surface to draw. Additional to subscribe to and handle events. I decided to put it in the Public Domain, so everyone could do what ever he /she want's with it. The repository contain a example folder showing some of the features supported by the layer. It's a tiny, but powerful abstraction of the X11 low level API to easier the process to create nice GUI's. Documentation is included in the source code, it's a single header and a single c file. All together just 654 lines, were most lines taken by documentation. So, here you go: https://github.com/brummer10/Xputty

4 years, 6 months

Click-free fade-in algorithm for synths?

by Johannes Lorenz

A note-on event can lead to clicks in synths, which is often fixed by a fade-in algorithm. If the attack rate for a synth's signal is 0, the synth shall not click, and still fade in as fast as possible. What is the best algorithm for fading in a signal, that scales also with small buffersizes, like 32 samples per buffer (at 44100 samples/s)? For example, in zynaddsubfx, we count the ascending zero crossings and calculate the fade-in length upon it [1]. Then, an S-curve of that length is multiplied with the signal. Counting zero crossings prevents clicking on lower notes, and it makes higher notes more punchy. That algorithm works very well for a buffersize of 256 samples (at 44100 samples/s), but it fails at 32 samples (since the zero crossings of 32 samples are often not representive). Any papers, or experience with other synths? We currently need a good solution for (at least) zynaddsubfx and the triple oscillator in LMMS. Links: [1] https://github.com/zynaddsubfx/zynaddsubfx/blob/4e36e765f677dbc689461889e50…

4 years, 6 months

Speakers and Schedule

by Sonoj Convention

Ladies and Gentlemen, this years Sonoj Convention is only a month away. (October 27th and 28th). https://www.sonoj.org/register.html Our list of speakers and talks is as good as finished now (except the start times). We will have a live world premiere of an unreleased open source synth (Vital), two talks about sampled instrument creations (Drumgizmo and an sfz bass), a tracker interface for Ardour, a Qtractor introduction by the author himself, modding old speakers into decent ones, the future of JACK and finally a talk about composing tricks and techniques.. On top there is an open slot for surprises! :) As you have read last time there is no visitor number limit anymore. But you still need to register if you want to come. Now is a good time to do just that: Write a mail to info(a)sonoj.org or use the website https://www.sonoj.org/register.html . Your name and e-mail address are enough. If you don't have time be aware that the whole event will be live streamed and you can interact with us and other remote visitors through a live chat. A link is already on the website. In the meantime: Have a look at our old recordings and please subscribe to our Youtube channel. https://www.youtube.com/channel/UCRETFHZgyoUMyUxz3k9lrZA/videos Yours, Nils Hilbricht Sonoj Convention -------------------------------------------------- You are receiving this Sonoj Convention Newsletter because you were registered as visitor or expressed a wish otherwise to receive notifications. Visit the Sonoj Website: https://sonoj.org Visit the Sonoj Archive: https://sonoj.org/archive Here is a list of the command addresses supported: Send mail to the following for info for this list: <list-info(a)sonoj.org> Tell your friends to subscribe by mailing to: <list-subscribe(a)sonoj.org> To stop subscription for this address, mail: <list-unsubscribe(a)sonoj.org>

4 years, 7 months

[ANN] Vee One Suite 0.9.10 - An Early Fall'19 Release

by Rui Nuno Capela

Summer's gone! So is the austral winter... The 'Vee One Suite' of so called 'old-school' software instruments are now released for the Northern Fall/Autumn season: * synthv1 0.9.10 [1] * samplv1 0.9.10 [2] * drumkv1 0.9.10 [3] * padthv1 0.9.10 [4] All available in dual form: - a pure stand-alone JACK client with JACK-session [5], NSM (Non Session management [6]) and both JACK MIDI and ALSA MIDI [7] input support; - a LV2 instrument plug-in [8]. Changes for this northern autumn'19 release goes like follows: - Upstream packaging is now split on JACK standalone, LV2 plugin and common core and UI packages, similar to recent Debian practice. - Highlight current element/sample/key on the virtual piano keyboard widget. (applies to samplv1 [2] and drumkv1 [3] only) - Added alternate yet non-official CMake build option. - Fix HiDPI display screen effective support (Qt >= 5.6). - All randomizers now compliant to the standard normal distribution. - Make sure compiler flags comply to c++11 as standard. The 'Vee One Suite' are free, open-source Linux Audio [10] software, distributed under the terms of the GNU General Public License (GPL) [11] version 2 or later. **synthv1 - an old-school polyphonic synthesizer [1] ** synthv1 0.9.10 (early-fall'19) is out! synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: https://synthv1.sourceforge.io http://synthv1.sourceforge.net project page: https://sourceforge.net/projects/synthv1 downloads: https://sourceforge.net/projects/synthv1/files - source tarball: https://download.sf.net/synthv1/synthv1-0.9.10.tar.gz - source package: https://download.sf.net/synthv1/synthv1-0.9.10-47.rncbc.suse.src.rpm - binary packages (openSUSE Tumbleweed): https://download.sf.net/synthv1/synthv1-0.9.10-47.rncbc.suse.x86_84.rpm https://download.sf.net/synthv1/synthv1-lv2-0.9.10-47.rncbc.suse.x86_84.rpm https://download.sf.net/synthv1/synthv1-common-0.9.10-47.rncbc.suse.x86_84.… - AppImage [9] package (JACK stand-alone only): https://download.sf.net/synthv1/synthv1-0.9.10-14.x86_64.AppImage git repos: https://git.code.sf.net/p/synthv1/code https://github.com/rncbc/synthv1.git https://gitlab.com/rncbc/synthv1.git https://bitbucket.org/rncbc/synthv1.git **samplv1 - an old-school polyphonic sampler [2]** samplv1 0.9.10 (early-fall'19) is out! samplv1 is an old-school polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: https://samplv1.sourceforge.io http://samplv1.sourceforge.net project page: https://sourceforge.net/projects/samplv1 downloads: https://sourceforge.net/projects/samplv1/files - source tarball: https://download.sf.net/samplv1/samplv1-0.9.10.tar.gz - source package: https://download.sf.net/samplv1/samplv1-0.9.10-47.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/samplv1/samplv1-0.9.10-47.rncbc.suse.x86_84.rpm https://download.sf.net/samplv1/samplv1-lv2-0.9.10-47.rncbc.suse.x86_84.rpm https://download.sf.net/samplv1/samplv1-common-0.9.10-47.rncbc.suse.x86_84.… - AppImage [9] package (JACK stand-alone only): https://download.sf.net/samplv1/samplv1-0.9.10-14.x86_64.AppImage git repos: https://git.code.sf.net/p/samplv1/code https://github.com/rncbc/samplv1.git https://gitlab.com/rncbc/samplv1.git https://bitbucket.org/rncbc/samplv1.git **drumkv1 - an old-school drum-kit sampler [3]** drumkv1 0.9.10 (early-fall'19) is out! drumkv1 is an old-school drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net/lv2 website: https://drumkv1.sourceforge.io http://drumkv1.sourceforge.net project page: https://sourceforge.net/projects/samplv1 downloads: https://sourceforge.net/projects/drumkv1/files - source tarball: https://download.sf.net/drumkv1/drumkv1-0.9.10.tar.gz - source package: https://download.sf.net/drumkv1/drumkv1-0.9.10-43.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/drumkv1/drumkv1-0.9.10-43.rncbc.suse.x86_84.rpm https://download.sf.net/drumkv1/drumkv1-lv2-0.9.10-43.rncbc.suse.x86_84.rpm https://download.sf.net/drumkv1/drumkv1-common-0.9.10-43.rncbc.suse.x86_84.… - AppImage [9] package (JACK stand-alone only): https://download.sf.net/drumkv1/drumkv1-0.9.10-14.x86_64.AppImage git repos: https://git.code.sf.net/p/drumkv1/code https://github.com/rncbc/drumkv1.git https://gitlab.com/rncbc/drumkv1.git https://bitbucket.org/rncbc/drumkv1.git **padthv1 - an old-school polyphonic additive synthesizer [4]** padthv1 0.9.10 (early-fall'19) is out! padthv1 is an old-school polyphonic additive synthesizer with stereo fx. padthv1 is based on the PADsynth algorithm by Paul Nasca, as a special variant of additive synthesis. LV2 URI: http://padthv1.sourceforge.net/lv2 website: http://padthv1.sourceforge.net https://padthv1.sourceforge.io project page: https://sourceforge.net/projects/padthv1 downloads: https://sourceforge.net/projects/padthv1/files - source tarball: https://download.sf.net/padthv1/padthv1-0.9.10.tar.gz - source package: https://download.sf.net/padthv1/padthv1-0.9.10-14.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/padthv1/padthv1-0.9.10-14.rncbc.suse.x86_84.rpm https://download.sf.net/padthv1/padthv1-lv2-0.9.10-14.rncbc.suse.x86_84.rpm https://download.sf.net/padthv1/padthv1-common-0.9.10-14.rncbc.suse.x86_84.… - AppImage [9] package (JACK stand-alone only): https://download.sf.net/padthv1/padthv1-0.9.10-14.x86_64.AppImage git repos: https://git.code.sf.net/p/padthv1/code https://github.com/rncbc/padthv1.git https://gitlab.com/rncbc/padthv1.git https://bitbucket.org/rncbc/padthv1.git References: [1] synthv1 - an old-school polyphonic synthesizer https://synthv1.sourceforge.io http://synthv1.sourceforge.net/ [2] samplv1 - an old-school polyphonic sampler https://samplv1.sourceforge.io http://samplv1.sourceforge.net/ [3] drumkv1 - an old-school drum-kit sampler https://drumkv1.sourceforge.io http://drumkv1.sourceforge.net/ [4] padthv1 - an old-school polyphonic additive synthesizer https://padthv1.sourceforge.io http://padthv1.sourceforge.net/ [5] JACK Audio Connection Kit http://jackaudio.org/ [6] NSM, Non Session Management http://non.tuxfamily.org/nsm/ [7] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [8] LV2, Audio Plugin Standard, the extensible successor of LADSPA http://lv2plug.in/ [9] AppImage, Linux apps that run anywhere https://appimage.org/ [10] Linux Audio consortium of libre software for audio-related work https://linuxaudio.org [11] GNU General Public License https://www.gnu.org/copyleft/gpl.html See also: https://www.rncbc.org/drupal/node/2035 Enjoy && Have fun! -- rncbc aka. Rui Nuno Capela

4 years, 7 months

FFADO 2.4.2 released

by Jonathan Woithe

The FFADO project is pleased to announce FFADO version 2.4.2. This is a bug fix release which mainly addresses some lingering issues associated with python3. While most of the fixes relate to the build process, one could affect the mixer GUI at runtime. FFADO 2.4.2 is a source-only release which can be downloaded from the project's website at http://ffado.org/, or directly from http://ffado.org/files/libffado-2.4.2.tgz. Thanks to those who contributed towards this version: Jinke Fan, Hector Martin, Orcan Ogetbil, David Runge and Jonathan Woithe.

4 years, 7 months

linuxaudio.org maintenance window 2019-09-10

by Jeremy Jongepier

Dear all, Tuesday September 10 I'd like to perform some maintenance on the linuxaudio.org servers between 09:00 and 12:00 CEST. Maintenance consists mainly of performing updates on the servers and booting them with the latest kernels. Downtime and impact should be minimal but if any weird things happen then please let me know at jeremy(a)linuxaudio.org. Best regards, Jeremy

4 years, 7 months

Spatial Audio / Vinyl Study in Berlin

by Henrik von Coler

Dear lists, (German below) we are looking for participants for a user study that deals with the use of timecode vinyl for spatial sound control on Ambisonics systems. Our call is especially aimed at people who have experience with vinyl (DJing) or spatial audio technologies. The experiment will be conducted from 10.09. until 13.09. in the Electronic Studio of the TU Berlin: https://www.ak.tu-berlin.de/menue/fachgebiet_audiokommunikation/adresse_und… The test duration is about one hour and will be compensated with 10 €. For students, the experiment can also be counted as a listening test participation. If you are interested, you can make an appointment via this Doodle: https://doodle.com/poll/t3a65f8bsc8az6pz Best regards Henrik von Coler Liebe Listen, wir suchen Teilnehmer*innen für eine Nutzerstudie, die sich mit der Verwendung von Timecode Vinyl zur räumlichen Klangsteuerung auf Ambisonics-Sysemen befasst. Unser Aufruf richtet sich im Besonderen an Menschen, die über Erfahrung im Umgang mit Vinyl (DJing) oder Spatial Audio Technologien verfügen. Der Versuch wird vom 10.09. bis zum 13.09. im Elektronischen Studio der TU Berlin durchgeführt: https://www.ak.tu-berlin.de/menue/fachgebiet_audiokommunikation/adresse_und… Die Versuchsdauer beträgt etwa eine Stunde und wird mit 10€ entschädigt. Für Student*innen läss sich der Versuch auch als Teinahme am Hörversuch anrechnen. Wer Interesse hat, kann sich über diesen Doodle einen Termin sichern: https://doodle.com/poll/t3a65f8bsc8az6pz Viele Grüße Henrik von Coler -- Henrik von Coler Elektronisches Studio, Fachgebiet Audiokommunikation Electronic Music Studio, Audio Communication Group Technische Universität Berlin Fakultät I Geistes- und Bildungswissenschaften Institut für Sprache und Kommunikation Faculty I Humanities Institute of Speech and Communication Einsteinufer 17c, Sekr. EN 8, 10587 Berlin Germany Tel: +49 (0)30 314 22327 Fax: +49 (0)30 314 21143 voncoler(a)tu-berlin.de www.ak.tu-berlin.de

4 years, 7 months

Berlin Linux Audio meeting @ c-base 2019-09-10

by Daniel Swärd

Hi all. The next meeting is on Tuesday the 10th of September at c-base. I'll be in the mainhall from 20:00. This time I'm bringing a Sensel Morph that I bought recently. Let's see what we can do with that. :-) Cheers /Daniel PS Let's keep the follow-up discussion in the thread on LAU. DS

4 years, 7 months

A bit of 2013 nostalgia!

by Louigi Verona

Hey everyone! I have recovered three tracks that I made during LAC2013. Restored from their sorry state to something more palatable, these 10 minutes of music will allow you to join me on this nostalgic journey and reminisce about times long gone! https://soundcloud.com/louigiverona/sets/lac2013 On track one you can hear samples taken out of the lecture by Rui on QStuff, which I recorded with a mic right there and immediately incorporated into the music. "You are the user!" This is true Linux Audio community lore :D Louigi Verona https://louigiverona.com/

4 years, 7 months

Sonoj Convention 2019 Announcement: Visitor registration, Call for talks, Donations

by Sonoj Convention

Dear Linux Audio Developers, The third annual Sonoj Convention ( https://www.sonoj.org ) will be taking place this upcoming October 26th-27th 2019 in Cologne, Germany. The convention is focusing on the combination of music production and open source software with a priority on practical music production. At Sonoj there will be talks, demonstrations, and workshops from demonstrating basic workflows to detailed instructions on how to subtly improve your sound. While the event will take place in Germany, all presentations and workshops will be in English, recorded and streamed to make them easily accessible to a wide audience. We want to welcome everyone, regardless of your musical or technical background. To get a better idea of what to expect out of Sonoj, you can find information and recordings from last year's convention in our archives: ( https://sonoj.org/archive ) As it was last year, admission to the convention is free, though donations are very much welcome. - Visitor Registration is now possible. The space is limited so please register on our website now. ( https://sonoj.org/register.html ) - We are looking for talks, demonstrations and workshops. If you would like to contribute, please send an informal and short e-mail with your ideas to info(a)sonoj.org - Donations are very welcome. Even if you don't attend personally please consider supporting a non-profit event to promote open source music making and production. We accept direct bank transfer and paypal ( https://www.sonoj.org/donate.html ) Yours, Nils Hilbricht https://www.sonoj.org

4 years, 7 months

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Linux-audio-dev September 2019