Linux-audio-user October 2010

linux-audio-user@lists.linuxaudio.org

116 participants
93 discussions

Steinway_IMIS2.2 soundfont (no loops fix)

by Roberto Gordo Saez

This is Steinway_IMIS soundfont, version 2.2. ftp://musix.ourproject.org/pub/musix/sf2/Steinway_IMIS2.2 This version fixes the issue with loops. I hope this is the good one and there are no more remaining major bugs. Marcos is a little busy right now, so he asked me to make this fix. He is thinking to make other improvements, so expect more updates soon.

1 year

[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

7 years, 7 months

[ANN] KMidimon 0.7.4 released

by Pedro Lopez-Cabanillas

KMidimon is a MIDI monitor for Linux using ALSA sequencer and KDE4 user interface. Changes in 0.7.4 * requires Drumstick >= 0.5 * load and play OVE files (Overture), contributed by Rui Fan * option to request real-time priority on MIDI input thread * option to (not) resize columns while recording * better reporting of file loading errors * revised universal sysex messages translation Copyright (C) 2005-2010, Pedro Lopez-Cabanillas License: GPL v2 More info http://kmidimon.sourceforge.net Sources http://sourceforge.net/projects/kmidimon/files/ Regards, Pedro

10 years, 8 months

Re: [LAU] Simple, easy multithreaded circular buffer library for Linux?

by Kjetil S. Matheussen

Olivier Guilyardi: > > Ken Restivo wrote: >> It has been over 7 years since I last messed around with writing Pthreads applications. >> >> I recall it as a painful, ugly, brain-numbing task. I located an exercise I did back then to address the consumer/producer problem in Pthreads, and just the sight of it is giving me a headache. >> >> I'm being lazy, so instead of researching everything that's out there, I'll ask here: can anyone recommend a relatively simple and painless abstraction library (GPL or LGPL of course) that will give me functions to create a thread in which I can stuff things into a ring buffer, and another thread in which I can pull stuff out of it? >> >> By the way, I know that JACK has a very nice event buffer which is insanely easy to use (and I have), and makes multithreading almost transparent, but this isn't a JACK app. > > I don't know of any abstraction library, but creating/terminating a normal > thread with pthread is really an easy task IMO. It's about 10 lines in C. > > For inter-thread communication there's Portaudio's ring buffer: > http://portaudio.com/trac/browser/portaudio/trunk/src/common/pa_ringbuffer.h > > It can easily be used out of Portaudio (I'm currently doing that), and it > features memory barriers [1] which AFAIK Jack's ringbuffer doesn't. > > One problem with everything Portaudio is this heavy naming scheme. For a simpler > API, you might like my little wrapper: > http://jackbeat.samalyse.org/browser/jackbeat/trunk/src/core/ringbuffer.h > Nice. It's probably quicker to copy the jack_ringbuffer.c file out of jack though. > Portaudio actually also offers a callback mechanism (with hidden thread > creation), so if you're coding an non-JACK audio app, you might want to check it > out. > > For thread synchronization, semaphores (man semaphore.h) are really easy to use. > However, if you need a lock-free equivalent (for realtime, ...) phtread mutex > and especially pthread_mutex_trylock are your friends. > Those friends can be really cranky sometimes though. By using atomic operations instead, it's possible to avoid a lot of headache by not having to synchronize at all. Performance might be better too. Midishare has lockfree atomic functions for lifo and fifi queues: http://midishare.cvs.sourceforge.net/viewvc/midishare/midishare/src/common/…

12 years, 3 months

Le Puzzle du Batteur - The Drummer's 'G'igsaw: GNU Bash + GNU sed replace gvim

by Phil Hézaine

Le Puzzle du Batteur - The Drummer's 'G'igsaw ***** Polymetric editor for Drums and Percussions based on Lilypond + GUI for randomization. (midi timing and/or volume) ****** PACKAGES You have to install: GNU Lilypond >= 2.12.0 http://lilypond.org/web/install/ midicomp 0.0.4 http://midicomp.opensrc.org/midicomp-0.0.4.tar.gz (compile in /usr/local/midicomp... and move midicomp.bin in /usr/local/bin Python 2.6.x with Tk option activated. Already in your Linux distribution. GNU Bash and GNU sed 4.2 by default in your Linux distribution. As default midi config I use Timidity++ 2.13.2 with eawpatches. ****** INSTALLATION Untar the archive. (tar jxvf ....) In your terminal go to your Drummer-s-Gigsaw's repertory. cd /home/....../Drummer-s-Gigsaw and run the bash script: sh INSTALL.sh You are done. ****** * In this new version you no longer need to gvim. Thus you can use your preferred text editor or even a dedicated editor like Frescobaldi or Lilypondtool... * Now you can write all notes values, from whole note (1) up to * one-hundred-and-twenty-eighth note (128) and even dotted values. * The manual is updated. (translated in my terrible English) * Le Puzzle du Batteur/The Drummer's 'G'igsaw is under GPLv3 or + ****** This new version at: http://philippe.hezaine.free.fr/spip.php?article46 Have fun. Phil.

12 years, 9 months

jackd in realtime as user: a no-go in spite of modifying limits.conf

by Der Mickster

Hey, Can't seem to start jackd in realtime as user on ubuntu studio. It does start as root, but that's hardly a consolation (unless I run all audio software as root, which would be kinda daft IMO) @audio - rtprio 99 @audio - nice -10 @audio - memlock unlimited have been added to /etc/security/limits.conf Nevertheless, starting it as user just doesn't seem to work, and I just can't figure out why. I've googled the issue, and everybody seems to agree that modifying limits.conf in the above manner should solve the problem - yet this is what I get: mick@kaizoku:~$ jackd -R -P89 -dalsa -dhw:0 -r48000 -p256 -n3 -S & [1] 3092 mick@kaizoku:~$ no message buffer overruns jackd 0.116.1 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. cannot use real-time scheduling (FIFO at priority 10) [for thread -1217255744, from thread -1217255744] (1: Operation not permitted) cannot create engine Any ideas? Mick.

13 years, 4 months

new guitarix breakout (gx_head)

by hermann

Hi list I have restructured guitarix a bit and split it into a amp head and two effect racks. It's in svn only for now. screen-shot from the AMP is here: http://img834.imageshack.us/img834/5087/screenshot027x.png I need some testers and feedback before I could make a release out of it. So please, if you are a guitar player, checkout our Sources and build gx_head. Let us know if you miss something or if you found a bug or a misconfiguration. get the source svn co http://guitarix.svn.sourceforge.net/svnroot/guitarix/trunk guitarix (like ever all FAUST.dsp Sources included) configure them cd ./guitarix /waf configure --prefix=/usr --includeresampler --includeconvolver --experimental --optimization --debug --no-faust --build_head that will build guitarix and also the new gx_head and build and install ./waf build ./waf install run it with gx_head greats hermann

13 years, 4 months

Introductory seq24 tutorial

by Leigh Dyer

Hi all, I've just posted a video tutorial for seq24 -- it discusses what seq24 is, and what it isn't, and then proceeds to demonstrate the basics of building and playing patterns. If you've tried it in the past and been confused by its somewhat unique interface, hopefully this will get you past that initial confusion. The direct Youtube link is here: http://www.youtube.com/watch?v=J2WDHS1wYeM and the post about it on my blog, which includes a downloadable copy of the video in WebM format (playable in VLC 1.1, or Firefox 4 beta, among other players), is here: http://wootangent.net/2010/10/linux-music-tutorial-seq24-part-1/ Thanks Leigh

13 years, 5 months

USB audio interface and a buggy USB controller

by Joan Quintana

It seems that my new laptop has a buggy USB controller (lspci says 'Intel Corporation 5 Series/3400 Series Chipset USB2') and this causes JACK to fail in 'duplex mode' and 'only recording mode' $ /usr/bin/jackd -dalsa -dhw:2 -r44100 -p1024 -n2 ... ALSA: could not start playback (Broken pipe) DRIVER NT: could not start driver ... I have an Edirol UA-25EX. I read about this problem in: *http://ubuntuforums.org/showthread.php?p=9812317 where points to *http://lists.linuxaudio.org/pipermail/linux-audio-user/2010-June/070365.html Any idea to deal with the problem? What to do? 1) Try to have the money back 2) Try to use a USB_2_ExpressCard converter like this one? http://www.delock.com/produkte/gruppen/Express-Card/Delock_Express_Card_to_… -> it says linux compatible If this works, the performance will be similar, better or worst? Thanks in advance, Joan Quintana PD. I checked a lot of things and grasped a lot of information thinking in my new laptop for audio production... but I never would thought in the USB chipset.

13 years, 5 months

Music made with linux: Abundance - Ambient-Psy-Trance

by Patrick Shirkey

Hi, I have uploaded a new mix I have done last night and this morning inspired by Halloween weekend 2010 in Sydney, Australia and in particular Stacey Pullen's excellent set. If you listen closely you may hear the influence. It's a long player - 808 MB - 65mins - flac, 48Khz, stereo http://djcj.org/audio/kotau/Abundance-Ambient-Psy-Trance-DJ_Kotau_Session_2… Recorded on a quad core Intel 3Ghz, 8GB RAM, Fedora 12, using ardour3 for multitracking, AMS for the pulsating bassline and Hydrogen for the drum sequencing. Designed to be played loud and immersively, and preferably with a large blast of dopamines to the brain. I think it could be enhanced with a seriously funky bassline. If anyone wants to take a stab at it, that would be cool wid me. It's definitely in there just about bursting to get out. Cheers. -- Patrick Shirkey Boost Hardware Ltd. "ZPE is not about creating something from nothing: It is about using the zero point of a wave as a means to transform other forms of potential energy like magnetic flux, heat, or particle spin into usable energy in such a way that entropy appears to be reversed."

13 years, 5 months

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Linux-audio-user October 2010