Linux-audio-dev

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3 participants
7520 discussions

Detecting 'ready' status of JACK-aware applications in Python

by Jonathan E. Brickman

What are good ways to pull a list of JACK ports in python and detect their readiness to accept connections? And/or, is there a better way to detect 'ready' status of JACK-aware applications? -- Jonathan E. Brickman | jeb(a)ponderworthy.com | (785)233-9977 Ponderworthy | http://ponderworthy.com Music of compassion; fire, and life!!!

10 years, 10 months

[maybe OT] question regarding the FIL equalizer

by Cedric Roux

Hi LAD, I have a technical question regarding the FIL equalizer (by Fons Adriaensen). The code uses Mitra-Regalia lattice filter (as described in [1]). After reordering things here and there I see it's indeed the case (surprise!). [1] might be hard to get, but there is [2] with a lot of details too, especially for bandwidth. The only remaining point that I don't get is the bandwidth manipulations. [1] uses for its parameter 'a' ('_s2' in FIL) the formula: a = (1 - tan(Omega/2)) / (1 + tan(Omega/2)) 'Omega' being I don't really know what (-3dB notch bandwidth for a gain of 0 maybe, if I read the paper correctly). FIL uses bandwith expressed in octave and does: _s2 = (1-b)/(1+b) with: b = bandwidth * 7 * (f0/fs) / sqrt(gain) ('f0' is the center frequency of the equalizer, 'fs' is the sampling rate) Reading [2] we see the factor 'sqrt(gain)' ('gain' is 'K') that we find in the FIL's formula (specifically the formula for k2 at page 13, after equation (17)). But the "bandwidth * 7 * (f0/fs)" remains a total mistery to me. It seems to be 'gamma' as found in [2], but 'gamma' is way more complicated than what we see in FIL's code. So the questions are: - can someone explain to me what this bandwidth computation means? - how it is derived starting from a bandwidth expressed in octave? - And if we use the notations of [1] and [2] how do we relate it to Omega or the various versions found in [2]? (which one is it by the way? I thought it was the "at the bandedge frequencies the gain is 'gain/2 dB'" one but it's not the case) (I wrote a little program to plot things and as far as my program is correct bandedge frequencies don't have a gain of 'gain/2 dB') Regards, Cédric. [1] P. A. Regalia and S. K. Mitra, “Tunable Digital Frequency Response Equalization Filters,” IEEE Trans. Acoust., Speech, Signal Process., vol. ASSP-35 (1987 Jan.). [2] http://www.musicdsp.org/files/EQ-Coefficients.pdf

10 years, 10 months

ams-lv2 1.1.0

by Aurélien Leblond

Hello all, The version 1.1.0 of ams-lv2 is now available: The two main "features" of this version are: - Ported tons of additional plugins from AMS (VCEnv & VCEnv II, Multiphase LFO, VC Organ, etc.) - Ported the changes from version AMS 2.1.1 (Bit Grinder, Hysteresis, the bug fixes, etc.) In addition, this release sees a lot of bug fixes or optimization. As a reminder, ams-lv2 are plugins to create modular synthesizers ported from Alsa Modular Synth. Here is a demo of an older version of these plugins. http://www.youtube.com/watch?v=LWfF71NerkQ ams-lv2 1.1.0 can be downloaded here: https://github.com/blablack/ams-lv2/releases/tag/v1.1.0 enjoy :) Aurélien

10 years, 10 months

Re: [LAD] [LAU] Graphic designer wanted

by Hermann Meyer

Thanks, I've created a job-page on the github job-board now. Sounds like it be a good place. regards hermann Am 13.02.2015 um 12:44 schrieb Cillian de Róiste: > Hi, > > You could try posting the details on: > https://github.com/opensourcedesign/job-board or asking on freenode > #opensourcedesign > > Good luck! > Cillian > > 2015-02-12 7:13 GMT+01:00 Hermann Meyer <brummer-(a)web.de>: >> Hi >> >> The topic say’s it all, any Graphic designer around here, who like to create >> a new, overall design for the guitarix project? >> If so, please contact me. >> >> regards >> hermann >> >> _______________________________________________ >> Linux-audio-user mailing list >> Linux-audio-user(a)lists.linuxaudio.org >> http://lists.linuxaudio.org/listinfo/linux-audio-user > >

10 years, 10 months

Graphic designer wanted

by Hermann Meyer

Hi The topic say’s it all, any Graphic designer around here, who like to create a new, overall design for the guitarix project? If so, please contact me. regards hermann

10 years, 10 months

Problems with time-scaling on records

by Álvaro Canelo Noriega

Hi! My name's Álvaro, from Barcelona [it's my first post to this list, so I say hello :) ]. I'm dealing with some issues with time-scaling and I'm a little bit lost trying to find the problem. I'm trying to record an analog audio input using *arecord*, in order to do some fingerprinting (features extraction). The problem is that after every reboot of the recording machine, the record has a different time scale so, as the fingerprint algorithm works with the relative position of energy peaks for different frequencies and the time them happen, the algorithm sometimes works, but sometimes fails. Could you give me any guidance to know where to search a possible solution for the time-scaling issue? Thank you very much in advance! Álvaro --- Forza saluti a tutti bacioni auguri in boca di lupo arrivederci ea presto pino

10 years, 10 months

a LAD survey (I need you !)

by e-rouge

Hello guys, I've followed this community for a while now and this is my contribution : a survey about LAD. *Why ?* I've made this survey to get a snapshot of what LAD community is, and to help understand how it works. This community has always worked in an informal way with ups and downs, and I thought it would be really useful to look at it with objectivity. *Who ?* It is open to any contributors of any Linux Audio Sofwares. *Who/What's for**?* This study aims to stay within LAD community and to provide very practical information. It does not intend to be part of a essay or any academic work. Actually its only purpose will be to provide a solid ground for further discussion about LAD's future. I've already started to gather qualitative data (as some of you know) an, while you answer this, I'll collect some more data about the projects themselves. Once all put together, we should get a very precise overview of what this community actually is. *How ?* *The survey itself takes around 30minuts to complete and they will be anonymized *before any publication (if you wonder why I ask for your name : it's to help me to build a projects-interactions graph as well as few other things). *When ?* Hopefully, I hope to get most answers within 2 or 3 months. After that it'll take a couple of weeks to analyze the data and write something about them. I'll keep you informed. . *Where ?* *Here's the link : * http://tumulte.me/lime/index.php/survey/index/sid/174631/token/bcdqg4tww7n6… I've made my best to think about the most relevant questions and possible answers, but if you thinks something is missing, wrong or whatever please contact me Thanks in advance, Etienne/Tumulte

10 years, 10 months

[LAU] [LAA] Guitarix 0.32.3 release

by Hermann Meyer

Release 0.32.3 is out, Guitarix is a tube amplifier simulation for jack (Linux), with an additional mono and a stereo effect rack. Guitarix includes a large list of plugins[*] and support LADSPA / LV2 plugs as well. The guitarix engine is designed for LIVE usage, and feature ultra fast, glitch and click free, preset switching and is full Midi (learn) and remote (Web-interface/ GUI) controllable (bluez / avahi) Changelog: * fix some rc-style bugs for KDE Qtcurve engine * add 2 new rc-styles (flat and green) * replace old outdated factory presets * add some new plugin presets * add jack midi out port to report state (CC messages) and control multiple instances with one interface * set engine.mute to default midi controller 120 (All Sounds Off) * add new command-line options -L start with Live Play GUI and -M start with engine muted * fix some issues with remote control GUI and external plugs Guitarix is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Please refer to our project page for more information: http://guitarix.sourceforge.net/ Download Site: http://sourceforge.net/projects/guitarix/ regards hermann _______________________________________________

10 years, 10 months

Linux Audio Conference 2015 - Extension of Deadline

by Frank Neumann

[Sorry for cross-posting, please distribute.] The Linux Audio Conference submissions deadline has been extended for another week! Please note the new deadline: Sunday, Feb 8th, 2015 (23:59 HAST) So, if you were considering to submit a paper but couldn't make up your mind yet, here is your chance to become active! Never forget that this conference lives through the people participating in it. February 8th is the new deadline for all submission types: papers, music, installations, workshop proposals. Check out the link below for more info: http://lac.linuxaudio.org/2015/participation Note that as usual we have created two different OpenConf instances: one for the submission of regular papers, lightning talks and poster sessions, and a second one for music, installations and workshop proposals. For the latter, please also check the detailed instructions at http://lac.linuxaudio.org/2015/download/lac2015-call-for-miw.pdf. If you have any questions concerning your submission, please don't hesitate to contact us at lac(a)linuxaudio.org, or through our #lac2015 IRC channel on freenode.net. Please spread this information to anyone who might be interested. We look forward to your submissions and hope to meet you in Mainz in April! Sincerely, The LAC 2015 Organizing Team

10 years, 10 months

[ANN] Qtractor 0.6.5 - The Fermion Ray beta is out!

by Rui Nuno Capela

Spread the word, Qtractor 0.6.5 (fermion ray beta) is out! Release highlights: * MIDI clip record/overdubbing (NEW) * Extended track multi-selection for mute/solo (NEW) * VST-shell sub-plugins support (NEW) * JACK transport start/stop resilience (FIX) And still, Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt4 framework. Target platform is Linux, where the Jack Audio Connection Kit (JACK) for audio and the Advanced Linux Sound Architecture (ALSA) 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.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://download.sourceforge.net/qtractor/qtractor-0.6.5.tar.gz - source package (openSUSE 13.2): http://download.sourceforge.net/qtractor/qtractor-0.6.5-15.rncbc.suse132.sr… - binary packages (openSUSE 13.2): http://download.sourceforge.net/qtractor/qtractor-0.6.5-15.rncbc.suse132.i5… http://download.sourceforge.net/qtractor/qtractor-0.6.5-15.rncbc.suse132.x8… - quick start guide & user manual (see also: the wiki): http://download.sourceforge.net/qtractor/qtractor-0.5.x-user-manual.pdf - wiki (help really wanted!): http://sourceforge.net/p/qtractor/wiki/ Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - Connections lines now drawn with anti-aliasing; connections splitter handles width is now reduced; the MIDI connections splitter pane sizes are now saved and restored properly. - Extended multi-selection is now featured on the track-list (main left-pane), primarily allowing for group mute/solo (and monitor) switching. - Track-list (left pane) header column widths are now saved and made persistent across application power cycle (double-click reverts to the old original default). - Minor fixes on the MIDI clip event list editor, also making sure the current event is visible on the piano-roll view. - As long to prevent asynchronous mistakes to JACK transport state changes, an internal slack-delay is now introduced after self-initiated transport commands (eg. start/stop). - The MIDI clip editor (aka. piano-roll) was missing to clear or reset the current selection when no shift/ctrl keyboard modifier is in effect. - VST-shell sub-plugins are now supported (as suggested by abique aka. Alexandre Bique, thanks). - MIDI clip record/overdubbing is now possible (Clip/Record on the main menu or File/Record from the MIDI clip editor. - Make sure some audio sample file encodings (eg. old Ogg Vorbis) does not head-start on audio peak generation. See also: http://www.rncbc.org/drupal/node/858 Enjoy && have fun. -- rncbc aka. Rui Nuno Capela

10 years, 11 months

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Linux-audio-dev