Linux-audio-dev

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7499 discussions

Tape emulation - is it worth the effort ?

by Fons Adriaensen

Hello all, The purpose of this post is to gather some opinions on the use of 'tape distortion' plugins. The way an analog magnetic tape recorder distorts the signal is quite complicated. The non-linear response is mainly due to the hysteresis of the magnetisation process, and how this interacts with the HF bias added to the recorded signal. Simplifying things a bit, as the tape moves past the recording head and away from it, it goes through several cycles of an hysteresis loop with decreasing amplitude, and it finally converges to some value more or less proportional to the signal. The bias signal itself does not remain on the tape, or at most at a very low level. The same process but with just a very high level HF bias is used to erase the tape. Simulating this accurately is quite complicated, and very CPU intensive. The sample rate must be at least twice the bias frequency (around 100 kHz for 'pro' equipment) and for each sample you need to evaluate the hysteresis loop up to a hundred times (depending on tape speed) to simulate the convergence. Over the past few months I've written the code to do this, with the aim to present a useful 'tape emulation' plugin at the next LAC. It uses a somewhat simplified form of the Preisach algorithm for the hysteresis. <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/preisach-model.pdf> But the first results are somewhat sobering. Have a look at <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/tapesaturation.png> This shows the tranfer function (recorded magnetic signal as a function of the input) for three values of the HF bias. The blue line is what you get without bias. It result in a very smooth saturation for high level signals, but a low amplitude signal will be severly distorted due to the flat region around zero. As bias level is increased, this effect is reduced and the low level gain increases up to some maximum. This is shown by the orange curve. The recommended way to set the correct bias level is to further increase it until the small signal gain is reduced by a few dB (typically 1 or 2 dB, depending on tape type). This is shown by the green curve. The central part of this is very linear (less than 1% THD). But now the smooth saturation is almost transformed into hard clipping. The sharp bend in the curve occurs when the signal amplitude is higher than the bias amplitude. The only effect that remains in a complete simulation is the result of the EQ applied to the signal to be recorded. Higher frequencies have a 'self erasure' effect (which is nicely reproduced by the simulation) and so need to be amplified. The net result is that they will saturate at a lower input level. How much EQ is required depends mainly on tape speed, higher speeds need less. At the most popular 'pro' speed (381 mm/s) this would be something around 10 dB at 10 kHz. At the higher (762 mm/s) speed typically used for 'master tapes' it's just a few dB. So what does effectively remain of the 'smooth saturation and compression' that is claimed to give tape recording its magical 'warm' character ? Is it just a myth ? I also simulated the green curve directly without going through the complicated full simulation, and honestly, to me that sounds just the same. And unless you really use very high levels (much more than would actually be used) the net effect is marginal. Maybe the hard clipping can be useful when applied to individual tracks (e.g. drums or bass), but then there are much simpler ways to do this than 'tape emulation'. Comments invited !!

7 months, 3 weeks

Re: [LAU] Tape emulation - is it worth the effort ?

by Fons Adriaensen

On Wed, Oct 16, 2024 at 05:57:33AM -1000, robertlazarski wrote: > When talking about the tape bias levels, the EchoFix is around 50hz and is > annoying enough that I high pass filter it out. You may have the wrong idea about what 'bias' is in this context. The bias used in analog tape recording is typically in the 100 kHz range, and even for 'consumer' level equipment at least 50 kHz. Ciao, -- FA

7 months, 3 weeks

Fluida v0.9.3 released

by Hermann Meyer

Fluida is a LV2 wrapper around Fluidsynth for Linux and Windows allowing to load and control Fluidsynth as LV2 plugin. This release of Fluida add support for Fluidsynth SoundFont Modulators Envelope and Filter with the following MIDI bindings: - MIDI CC 73 Soundfont modulator Envelope Attack Time - MIDI CC 72 Soundfont modulator Envelope Release Time - MIDI CC 74 Soundfont modulator Filter Cutoff - MIDI CC 71 Soundfont modulator Filter Resonance Project Page (Source Code): https://github.com/brummer10/Fluida.lv2 Release Page (Binaries): https://github.com/brummer10/Fluida.lv2/releases/tag/v0.9.3

8 months

[ANN] Qtractor 1.3.0 - An Early-Fall'24 Release

by Rui Nuno Capela

Cheers everyone, Qtractor 1.3.0 (early-fall'24) is released! Change-log: - Use timebase-aware JACK API for relocation; provide `bar_start_tick` in JACK Transport/Timebase BBT information. - Always reset the target bus when copying or moving an Aux-Send insert into an audio output bus. - Mixer: fixed dangling track removal after one of its buses has been previously deleted." - Fixed MIDI clip offset resizing, most especially when drag-moving the left-edge. - Audio Aux-sends inserted on audio output buses are not restricted to later buses anymore; the only restriction now is that no cyclic or loop-back routes are allowed; audio output buses are now sorted internally in-place for correct processing order. - Update all Aux-Send inserts whenever their respective output bus gets renamed or deleted. - User preference option View/Options.../General/Options/Reverse keyboard modifiers role (Shift/Ctrl), now also applying to the play-head and/or edit-head/tail re-positioning in the timeline. - Plug-in name/title alias makes its debut. - Fixed a partial port-name filtering issue on the MIDI Connections widget. - Last selected automation curve color is now persistent and the default for all later automation curves. - Connections: connector line colors are now uniquely mapped on a (readable/output) client name basis. 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: https://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-1.3.0.tar.gz - source package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-1.3.0-5.1.rncbc.suse.src.rpm - binary package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-1.3.0-5.1.rncbc.suse.x86_64.rpm - AppImage [7] package: https://download.sf.net/qtractor/qtractor-1.3.0-5.1.x86_64.AppImage - Flatpak [8] package (thanks Hubert Figuière): https://flathub.org/apps/details/org.rncbc.qtractor Git repos: https://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor.git https://gitlab.com/rncbc/qtractor.git https://codeberg.org/rncbc/qtractor.git Wiki: https://sourceforge.net/p/qtractor/wiki/ - static rendering: https://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 https://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 https://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] Flatpak, next-generation technology for building and distributing desktop applications on Linux https://flatpak.org/ See also: https://www.rncbc.org/drupal/node/2667 Enjoy && Keep the fun! - - - rncbc aka Rui Nuno Capela

8 months

Bugfix update of zita-bls1

by Fons Adriaensen

Hello all, Version 0.4.0 of zita-bls1 is available at <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> fixing a bug resulting from the update of the zita-convolver library from major version 3 to 4. This required a small change in zita-bls1, but that updated version was not released... Ciao, -- FA

8 months

[ANN] Vee One Suite 1.1.2 - An Early-Fall'24 Release

by Rui Nuno Capela

Hello again, The 'Vee One Suite', the so called 'gang-of-four' 'old-school' software instruments, * synthv1 [1] as a polyphonic subtractive synthesizer; * samplv1 [2] a polyphonic sampler synthesizer; * drumkv1 [3] as yet another drum-kit sampler; * padthv1 [4] a polyphonic additive synthesizer. Are here released for the northern Early-Fall'24 season... All delivered in dual form: - a pure stand-alone JACK client with JACK-session [5], NSM (Non/New Session Management [6]) and both JACK MIDI and ALSA MIDI [7] input support; - a LV2 instrument plug-in [8]. Change-log: - Configure: apply Frame/Time display format and Use GM Standard drum names options immediately on acceptance, no need to restart the application to take effect anymore. (samplv1 [2] and drumkv1 [3] resp.) - Configure: disable widget style option on LV2 plug-ins only, for which it wasn't working on the JACK stand-alones either. 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 1.1.2 (early-fall'24) 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/synthv1-1.1.2.tar.gz - source package: https://download.sf.net/synthv1/synthv1-1.1.2-4.1.rncbc.suse.src.rpm - binary packages (openSUSE Tumbleweed): https://download.sf.net/synthv1/synthv1-jack-1.1.2-4.1.rncbc.suse.x86_84.rpm https://download.sf.net/synthv1/synthv1-lv2-1.1.2-4.1.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/synthv1/synthv1-jack-1.1.2-4.1.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://codeberg.org/rncbc/synthv1.git **samplv1 - an old-school polyphonic sampler [2]** samplv1 1.1.2 (early-fall'24) 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/samplv1-1.1.2.tar.gz - source package: https://download.sf.net/samplv1/samplv1-1.1.2-4.1.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/samplv1/samplv1-jack-1.1.2-4.1.rncbc.suse.x86_84.rpm https://download.sf.net/samplv1/samplv1-lv2-1.1.2-4.1.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/samplv1/samplv1-jack-1.1.2-4.1.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://codeberg.org/rncbc/samplv1.git **drumkv1 - an old-school drum-kit sampler [3]** drumkv1 1.1.2 (early-fall'24) 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/drumkv1-1.1.2.tar.gz - source package: https://download.sf.net/drumkv1/drumkv1-1.1.2-4.1.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/drumkv1/drumkv1-jack-1.1.2-4.1.rncbc.suse.x86_84.rpm https://download.sf.net/drumkv1/drumkv1-lv2-1.1.2-4.1.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/drumkv1/drumkv1-jack-1.1.2-4.1.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://codeberg.org/rncbc/drumkv1.git **padthv1 - an old-school polyphonic additive synthesizer [4]** padthv1 1.1.2 (early-fall'24) 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/padthv1-1.1.2.tar.gz - source package: https://download.sf.net/padthv1/padthv1-1.1.2-4.1.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/padthv1/padthv1-jack-1.1.2-4.1.rncbc.suse.x86_84.rpm https://download.sf.net/padthv1/padthv1-lv2-1.1.2-4.1.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/padthv1/padthv1-jack-1.1.2-4.1.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://codeberg.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 https://jackaudio.org/ [6] NSM, Non Session Management (legacy) http://non.tuxfamily.org/nsm/ New Session Manager https://new-session-manager.jackaudio.org/ [7] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [8] LV2, Audio Plugin Standard, the extensible successor of LADSPA https://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/2665 Enjoy && Keep having (lots of) fun! - - - rncbc aka. Rui Nuno Capela

8 months

[ANN] Qsynth 1.0.2 - An Early-Fall'24 Release

by Rui Nuno Capela

Howdy! Qsynth 1.0.2 (early-fall'24) is out! Qsynth is a FluidSynth [2] GUI front-end application written in C++ around the Qt framework [3] using Qt Designer. Change-log: - Peppino knob graphic style refined to follow designated palette color theme (and not being such an ugly style anymore;)). Website: https://qsynth.sourceforge.io http://qsynth.sourceforge.net Project page: https://sourceforge.net/projects/qsynth Downloads: https://sourceforge.net/projects/qsynth/files - source tarball: https://download.sf.net/qsynth/qsynth-1.0.2.tar.gz - source package: https://download.sf.net/qsynth/qsynth-1.0.2-3.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qsynth/qsynth-1.0.2-3.1.rncbc.suse.x86_64.rpm - AppImage [7] package: https://download.sf.net/qsynth/qsynth-1.0.2-3.1.x86_64.AppImage - Flatpak [8] package: https://flathub.org/apps/details/org.rncbc.qsynth Git repos: https://git.code.sf.net/p/qsynth/code https://github.com/rncbc/qsynth.git https://gitlab.com/rncbc/qsynth.git https://codeberg.com/rncbc/qsynth.git License: Qsynth [1] is free, open-source Linux Audio [4] software, distributed under the terms of the GNU General Public License (GPL) version 2 or later [5]. References: [1] Qsynth - A fluidsynth Qt GUI Interface https://qsynth.sourceforge.io [2] Qt framework, C++ class library and tools for cross-platform application and UI development https://qt.io/ [3] FluidSynth - A SoundFont Synthesizer A real-time software synthesizer based on SoundFont 2 specifications https://www.fluidsynth.org [4] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [5] GPL - GNU General Public License https://www.gnu.org/copyleft/gpl.html [6] AppImage, Linux apps that run anywhere https://appimage.org/ [7] Flatpak, next-generation technology for building and distributing desktop applications on Linux https://flatpak.org/ See also: https://www.rncbc.org/drupal/node/2660 Enjoy && Keep having fun! - - - rncbc aka Rui Nuno Capela

8 months, 1 week

dkbuilder-guitarix-lv2-plugins-1.0.1 is out

by Dominique Michel

dkbuilder-guitarix-lv2-plugins is a set of LV2 plugins and faust code generated by dkbuilder. 1.0.1 is the initial release and it introduce the Blow Me Amplifier, a set of vacuum tubes guitar preamplifier and head designed to not compromise the sound. Which is relative because when combined to make a complete amplifier, these plugins offer a lot of gain and saturation. The Blow Me is modelled from a real hardware I made that way because I like punchy saturated and clear sounds, and the best way to get dynamic saturated sounds is when the hardware don't compromise or mess with the sonic quality for financial reason. It is under GPL-3. That release contain the gschem schematics and the resulting LV2 and faust code for use with LV2 and XUiDesigner. As the gain is huge, I made versions of these plugins with different volume curves and defaults, which should make them suitable for different use cases like independent LV2 plugins or with guitarix and that, out of the box. https://github.com/domichel/dkbuilder-guitarix-lv2-plugins Enjoy, Dominique

8 months, 1 week

AlsaPlayer 0.99.82 is out

by Dominique Michel

A long awaited release: 0.99.82 I apologize for that delay. I think I miss-understood a message from erikd on the mailing list. The hard work was done by erikd - Erik De Castro Lopo. It consist of a rewrite of the internal of AlsaPlayer in order to suit contemporary coding audio standards with modern computing. https://github.com/alsaplayer/alsaplayer Enjoy, Dominique

8 months, 1 week

LAC 2025: Linux Audio Conference 2025 (Lyon, France, June 28-28, 2025) -- Call for Contributions

by Romain Michon

[sorry for cross-posting, please distribute widely] Hi folks, I must say that I feel a little bit ashamed to send this call right after Charles' official announcement of NIME 2025, which has potentially conflicting dates with the event presented below. Really sorry about that... After a few "quiet" post-covid years, Linux Audio Conference is returning in 2025 (https://jimlac25.inria.fr/lac/)! It will take place in Lyon (France) on June 26-28, 2025 under the hospices of Inria, INSA Lyon, and GRAME-CNCM. It will be preceded by the "Journées de l'Informatique Musicale (JIM)" which will also happen in Lyon (June 23-25, 2025). LAC 2025 welcomes scientific, technical, and artistic contributions. It is free and as open as possible. In that regard, we slightly adapted the call below to encourage submissions by people outside of the academic community. While it is possible to submit academic papers (that will be peer-reviewed and published in the LAC 2025 proceedings), open presentations, not necessarily connected to a paper, can be proposed as well. We look forward to seeing you in Lyon in June! *Important Dates *- March 24, 2025: Paper submission deadline - April 18, 2025: Review deadline - April 25, 2025: Notification of acceptance - May 23, 2025: Camera-Ready version deadline - June 23-25, 2025: Journées de l'Informatique Musicale (JIM) - June 26-28, 2025: Linux Audio Conference (LAC) *Call for Papers / Presentations / Demos / Workshops* LAC 2025 invites submissions of papers, presentations, and workshops addressing all areas of audio processing based on Linux and open source software. All submissions and presentations are in English. Submissions can focus on technical, artistic, and/or scientific issues and target developers and/or users. This includes (but is not limited to) the following categories: - Audio and Music Languages - Audio and AI - Audio Hardware Support - Audio Plugins - Drivers, System and Sound Architecture - Education and E-Learning - Games - Interactive Art - Interface Design - Live Coding - Live Performance - Media Art - MIDI, OSC... - Mobile Audio - Music Composition - Music Production - Networked Audio - Physical Computing - Projects Realized using Linux Audio - Realtime Kernel and Linux Distributions - Signal Processing and Sound Synthesis - Sound Spatialization - Standards and Protocols - Video - Etc. *Full Papers* Full papers must be written and presented in English. The length of papers is 4 to 8 pages, with up to 5 keywords, including an abstract of up to 200 words. The abstract will be published on the conference website once the paper has been accepted. Full papers will be available on the website during the conference, and after in the proceedings (which will be published with an ISBN number). All papers are peer reviewed by a committee of experts from different disciplines. Reviewers may suggest improvements to the author(s), require changes in order to accept the submission, or reject it. Full papers will be presented during the conference as in-person oral presentations. *Presentations Without an Associated Paper *LAC 2025 welcomes oral presentations not associated to a peer-reviewed paper published in the conference proceedings. Such presentations are selected by the scientific committee, based on a abstract up to 500 words, with up to 5 keywords. No full paper is required in this category. The abstract will be available on the website during and after the conference. Presentations in this category have the same format as full paper presentations and will hence be presented during the conference as in-person oral presentations. *Demos *Demos are informal project (e.g., plug-in, software, interface, idea, etc.) presentations that will be carried out between the papers presentation sessions. *Workshops *Workshop presentations (max duration of 2h) should be 1-4 pages, with up to 5 keywords, including an abstract of up to 150 words to be published on the conference website. Make sure that your proposal indicates if participants are expected to have a specific level, if there are prerequisites, if you'd like to limit the number of participants, if you have specific technical requirements, etc *Call for Music * We invite submissions of electronic, electroacoustic and mixed music as well as interactive art installations with an emphasis on open source software. A jury will select the compositions and performances to be included in the LAC 2025 conference program according to artistic merit and technical feasibility. Applicants should expect to perform their work themselves and have all resources needed to perform the piece if selected (e.g., instruments, props, other performers, etc.). *Concert Venues* The LAC 2025 musical program will consist of three concerts, two of which will take place at Le Théâtre Astrée (https://theatre-astree.univ-lyon1.fr/qui-sommes-nous/), a concert hall equipped with an 8.4 sound system. For this venue, we are particularly interested in electronic / computer music pieces that will leverage the multichannel set up. The third concert will take place at Le Sucre (https://le-sucre.eu/le-lieu/), an event that will host live coding sets and other performances devised for a night club setting with stereo diffusion. *How to Submit Your Work?* Please, visit the lac website for additional information on how to submit your contribution to LAC 2025: https://jimlac25.inria.fr/lac/ *Contact* For any questions, feel free to contact us at jimlac25(a)grame.fr

8 months, 1 week

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