Linux-audio-user July 2015

linux-audio-user@lists.linuxaudio.org

74 participants
61 discussions

[linux-audio-user] Sub-harmonic generator? (LADSPA or VST)

by Tim Howard

Hello, Does anyone know of a good plugin that will generate subharmonics? I would like to put a little more low frequency "oomph" into my bass track. Preferrable LADSPA, but VST would work, too. Thanks for any help! -TimH

9 years, 2 months

Alternative FluidSynth GUI?

by Dan Capp

Research tells me that QSynth seems to be the only currently available/usable GUI for FluidSynth, but I get big xruns whenever I try and use it. FluidSynth itself doesn't cause me problems (I know because I'm able to use the FluidSynth-DSSI plugin fine in Rosegarden etc). The problem is that I want to use FluidSynth with Ardour3, but Ardour3 doesn't support DSSI plugins yet. So the only solution I have is to find a standalone interface for FluidSynth and then to link up using Jack. I looked at the old GUI 'FluidGUI' but it seems to be so old that it won't properly install on recent versions of Ubuntu. So does anyone know of: 1) A GUI for FluidSynth other than QSynth and FluidGUI?... or 2) An application other than the above 2 which would allow me to load soundfonts? Thanks in advance. - Dan

9 years, 10 months

OT? Downloaded youtube videos with subtitles

by Ivan K

I was very excited to find a video of the complete Tristan and Isolde on YouTube recently, complete with English subtitles. I used the youtube-dl utility to grab the video, but when I began playing the copy on my hard-drive with totem, to my horror, the English subtitles were not there! To repeat, the subtitles are on youtube.com but not in the .webm file that I downloaded with youtube-dl. Can someone coach me how to download a version with the English subtitles? Or are there subtitles in my downloaded version and totem is just not playing them? Thank you for your help. P.S. On the totem menu under View, there is a command called Subtitles but this prompts me for another file. Is there a subtitle file in addition to the video file that I need to download from youtube? Thanks again.

10 years

re Zoom R16

by reSet Sakrecoer

Hi all! I found this old discussion about the Zoom R16 in the archive of LAU. http://linuxaudio.org/mailarchive/lau/2012/3/14/188926 Strangely, in that archive there is a missing reply from Mr. Brett McCoy. (You can find the missing one a the bottom of this archive: http://linux-audio.4202.n7.nabble.com/Zoom-R16-td7748.html ) Mr. McCoy claims to have enabled the Zoom R8 (yes, there is quite a difference between r16 and r8) as a multi-input soundcard for ardour and also as a control surface in 12.04 64bits. There is no information as to which driver is being in use in his post. And searching the web only leads me to various WIP to get the R16 running on linux. My question is, has anyone got any news about this device and a possible drivers? Specifically to Mr. Brett McCoy: what driver did you use to make jack aware of your r8? Thank full for any hints, yours, -- Set Hallström AKA reSet Sakrecoer http://sakrecoer.com

10 years

New hardware setup for recording (not same as existing threads)

by Martin Cracauer

I am also looking to have a conversation about recording hardware, but not quite the same as the PCI one. Short story: If I wanted to have a combination of two separate devices, analog->ADAT unit and ADAT->Linux@computer, what would I buy? Long story: The way that I did quality recordings so far: - use a quality preamp from mic to S/PDIF optical - use a USB soundcard with (under Linux) working S/PDIF in - jackd of course - depending on hardware there might be a separate piece in front that converts symmetric microphone level to line out, but right now my first thing does both mic level and line level well I really like how this is separating out the [analog part, A/D converter] and the [thing that needs a Linux driver]. Now I can change one or the other and don't get utter breakdown on software changes. I have hardware pieces for which this works great... ish except for some USB unreliability. Now, the careful observer will notice that this is limited to 2 channels due to S/PDIF. While I could have more USB soundcards that does not satisfy synchonization since the stupid things with S/PDIF don't take world clocks. My attempts to link multiple jackds have been, well I think everybody here knows that this exactly working well. So I want to get the concept of separating this out further. Now I need: - analog part is a few line in or mic level inputs to ADAT - a "soundcard" that takes binary ADAT and gives me Linux-able input. Ideally I would like this to be 24 bit capable (I don't need > 48 MHz but I'd like > 16 bit) - once there I could add more sync ADAT takes a world clock I wonder whether somebody has recommendations for these two parts. Digital part with great Linux support, and what do I use for analog to ADAT? My computers still have native PCI, but... well to be honest PCI sucks, USB sucks, Firewire is old. Is anything Thunderbolt out yet that does ADAT to Thunderbolt with open source Linux drivers? Haha, very funny. Can we make one? Sorry for the long post. I hope the concept makes sense. I really like this more modular setup that allows you to toss one thing at a time and don't sit there with nothing on changes. Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer <cracauer(a)cons.org> http://www.cons.org/cracauer/

10 years, 1 month

Octave plugin fx

by Nicola

Hi all, Does anybody know if there are good octave plugins/standalone available on Linux? My aim would be to use my guitar also as a bass guitar avoiding to buy one. Anybody tried this solution do you think is feasible? Does guitarix for instance provide a tool like this now (I'm using an non-updated version on my Linux squeeze box)? Many thanks Nicola -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

10 years, 3 months

Jack max ports question

by Peter P.

Hi list, today I got some time to play around with RME's Madiface (and its ExpressCard) under Linux/Jack. The card uses Thomas' old hdspmixer with correct display and routing abilities, it's simply awesome to have 64Ins and 64outs on a Linux laptop! However I didn't get beyond the following weird problem: Starting PureData outputting 64 channels via jack as pd -jack -channels 64 works and connects and outputs to the Madiface's hardware outs. If I try to start other audio software (mplayer, alsaplayer) asking them to output to the first two jack outputs (while Pd is also using them), I get in qjackctl's message window no ports available! and in mplayer cannot deliver port registration request [JACK] not enough ports available Failed to initialize audio driver 'jack' and in alsaplayer cannot deliver port registration request cannot deliver port registration request Segmentation fault all followed by a massive xrun in qjackctls message window **** alsa_pcm: xrun of at least 4995.700 msecs Now if I start Pd with less outputs, for examples pd -jack -channels 32 then mplayer is perfectly able to output on the the first two hardware channels in parallel with Pd. The weird thing: Jackd's 'max port' argument is set to 256, and the problem persists also with 512 ports. Am I missing something here? Background info: jackd version 0.124.1 tmpdir /dev/shm protocol 25 is started via qjackctl as jackd -P89 -t5000 -dalsa -r44100 -p256 -n2 -D -Chw:Default -Phw:Default -i64 -o64 on kernel 3.14-2-rt-amd64 #1 SMP PREEMPT RT Debian 3.14.15-2 (2014-08-09) x86_64 GNU/Linux Thank you for any suggestions! Peter

10 years, 3 months

outfitting a computer for songwriting in linux?

by Karen Lewellen

Hi All, I've been a reader on the list for a while, not a poster until now. I am preparing to outfit a computer for songwriting in Linux. I will be using the command line notation options, of which there are rather a few from Lillypond to muscript. I am hoping that how I picture this will match the creative reality smiles. My first question is this. some high end soundcards that are supported in Debian? I know its been updated, but I intend using squeeze for a start. Getting the floor solid before say adding updated furniture. While I know that four duplex cards are common, I want the best quality I can find for the work. say if you <hope this makes sense> wanted to connect a full sized piano keyboard to the card? Thanks in advance, Karen

10 years, 3 months

[ANN] Qtractor 0.7.0 - The Muon Base is out!

by Rui Nuno Capela

Ahoy! Stepping up to Summer'15 release frenzy stage scene, in it's fourth and hopefully last act, Qtractor 0.7.0 (muon base beta) is out! 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. As a major highlight to this release, there's the advent of regular MIDI controllers mapping/assignment to main application menu command actions, just like normal PC-keyboard shortcuts, is being introduced (cf. main menu Help/Shortcuts...). Have a 'hotta' Summer'15 ;) Enjoy. Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://www.rncbc.org/archive/qtractor-0.7.0.tar.gz - source package (openSUSE 13.2): http://www.rncbc.org/archive/qtractor-0.7.0-18.rncbc.suse132.src.rpm - binary packages (openSUSE 13.2): http://www.rncbc.org/archive/qtractor-0.7.0-18.rncbc.suse132.i586.rpm http://www.rncbc.org/archive/qtractor-0.7.0-18.rncbc.suse132.x86_84.rpm - wiki (help wanted!): http://sourceforge.net/p/qtractor/wiki/ Weblog (upstream support): http://www.rncbc.org License: Qtractor [1] is free, open-source Linux Audio [6] software, distributed under the terms of the GNU General Public License (GPL [5]) version 2 or later. Change-log: - Complete rewrite of Qt4 vs. Qt5 configure builds. - Revised MIDI Controlllers catch-up algorithm. - Mixer multi-row layout gets a little bit of a fairness fix. - Non-continuous MIDI Controllers now have their Hook and Latch options disabled as those are found not applicable, - As an alternative to PC-keyboard shortcuts, MIDI controllers are now also assignable and configurable for any of the main menu command actions, all from the same old configuration dialog (Help/Shortcuts...). - Fixed missing Track and Clip sub-menus from Edit/context-menu that were found AWOL ever since after the Lazy Tachyon beta release (> 0.6.6). - An off-by-one bar position (as in BBT, bar, beat and ticks) has been purportedly fixed as long as LV2 Time/Position atom event transfer goes. - French (fr) translation line to desktop file added (patch by Olivier Humbert, thanks). - A new top-level widget window geometry state save and restore sub-routine is now in effect. - Improved MIDI clip editor resilience across tempo and time-signature changes. - Keyboard shortcuts configuration (Help/Shortcuts...) now lists complete menu/action path where available. - Fixed in-flight VST plugin editor (GUI) resizing. - Added support to LV2UI_portMap extension, found really handy for the cases where you have multiple plugins with different port configurations and a single common UI to drive them all (pull request by Hanspeter Portner aka. ventosus, thanks). References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [6] http://linuxaudio.org See also: http://www.rncbc.org/drupal/node/917 Enjoy && keep the fun. -- rncbc aka. Rui Nuno Capela

10 years, 3 months

MIDI jitter - Was: outfitting a computer for songwriting in linux?

by Ralf Mardorf

Jeremy, we shouldn't discuss this in the original thread. There are latency test measurements in the mailing list archive. PCI and PCIe cards show better results, IOW less MIDI jitter. There are also explanations why USB suffers from more jitter. The point of difference is, if the MIDI jitter is audible. It is! The measurements might not provide correct results. To measure a system by itself is a bad test and to measure a MIDI loop in addition is tricky. Jakob (living in Augsburg) from a Linux mailing list (perhaps LAU or LAD) years ago send me a board to loop through MIDI and that provides an audio output, to record the MIDI signal to an audio track. I never had time and interest to continued my MIDI jitter tests, so I still didn't use it. I guess this would be a better test, then the latency test. Howsoever, it's better to use PCI or PCIe, IIRC some USB interfaces even fail(ed) the latency test that measures a MIDI loop. The USB interface I own doesn't fail the test, but I'm anyway not satisfied and use PCI and PCIe MIDI only. That's it, I can't provide more information and I'm not willing to search the mailing lists archives. Regards, Ralf

10 years, 3 months

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Linux-audio-user July 2015