Linux-audio-user February 2010

linux-audio-user@lists.linuxaudio.org

169 participants
129 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, 7 months

[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

8 years, 2 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, 10 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, 11 months

Connie, an organ template for JACK

by Martin Homuth-Rosemann

Hi, sorry, just realized that the hammond discussion mentioned below was here and not at LAD, so please allow this kind of "crosspost": this is my first post to LAD. The discussion about a hammond simulation "Fons could you make us...", Beatrix and some research for writing a (german) wikipedia article (stub) about the Vox Continental inspired me to hack a quick organ program that simulates the internal signal flow of the "Connie" with JACK MIDI input and JACK audio output. Have fun: http://cryptomys.de/horo/Connie/Connie-0.1.tar.gz Ciao Martin Homuth-Rosemann

14 years, 3 months

yet another yoshimi bug fix, -> 0.021

by cal

Frank Kober wrote: > Hi there, > I just noticed that I'm not able to save sounds to my custom root bank directory, > and wondered if I did something wrong setting this up in my home. Also, when I > try to change the name of the current sound with a right click, the dialog opens > OK and lets me enter the patch name, but it won't keep it when I click OK. > Any idea? I thought about my bank dir file permissions, but they seem to be OK. > I'm not sure, but I think that this worked already with yoshimi. I cannot tell the > last version with which it did though... Right click instrument name change now works. For me, saving to a custom bank root seems ok, but some funkiness there wouldn't greatly surprise me. If it still doesn't satisfy, perhaps you can spell out the steps you're taking and from that I'll hopefully be able to figure out where it's going wrong. 0.021 fix right click instrument rename and a couple of bank management issues <http://www.graggrag.com/?q=yoshimi> cheers, Cal

14 years, 6 months

[ANN] LADI Session Handler - Preview 2

by Nedko Arnaudov

The second milestone is reached and result is a tarball that brave souls may want to download and try. It can start apps and restore their connections. Level 1 apps are supported. Beware that no apps have implemented level 1 yet. If non-level-1 app is started at level 1, it will probably quit on save, because the default signal handler for SIGUSR1 terminates the process. This preview also features a2jmidid support. Run the a2j script as an app in the studio. This is a beta quality software, use it with double caution. I would like to thank the early adopters and especially Frank Kober for their help with testing the git ladish code and for the valuable suggestions they gave. Build will produce three operational components: * ladishd - The daemon, a D-Bus service * gladish - GTK GUI interface * ladish_control - Command-line interface In the tarball you will also find bundled: * flowcanvas-0.6.0 * LADI Tools (svn version) * a2jmidid-6 (contains the a2j script for use in ladish) * jack2 from the ladi branch The jack2 ladi branch contains fixes for two important issues: * Race that causes connection restore to fail sometimes during studio startup (http://ladish.org/ticket/28) * A deadlock on studio start (http://ladish.org/ticket/35) Hopefully, these fixes with be in the next jack2 release (1.9.5). The jack2 ladi branch also contains the no-self-connect changeset that adds new engine option, for disabling self connect of apps. Default value for this option is to allow self connections. Make sure to configure jack2 with --dbus (and maybe with --classic too). Download: http://ladish.org/download/ladish-0.2.tar.bz2 http://ladish.org/download/ladish-0.2.tar.bz2.sig Homepage: http://ladish.org/ Roadmap: http://ladish.org/roadmap --------------------------------------------------------------------- LADI Session Handler or simply ladish is a session management system for JACK applications on GNU/Linux. Its aim is to allow you to have many different audio programs running at once, to save their setup, close them down and then easily reload the setup at some other time. ladish doesn't deal with any kind of audio or MIDI data itself; it just runs programs, deals with saving/loading (arbitrary) data and connects JACK ports together. It can also be used to move entire sessions between computers, or post sessions on the Internet for download. Project goals: * Save and restore sets of JACK (audio and MIDI) enabled applications. * Provide JACK clients with virtual hardware ports, so projects can be transfered (or backups restored) between computers running different hardware and backups. * Don't require session handling library to be used. There is no need of such library for restoring connections between JACK clients. * Flow canvas based GUI. Positions of elements on the canvas are saved/restored. * Allow clients to use external storage to save its state. This includes storing internal state to non-filesystem place like memory of a hardware synth. This also includes storing client internal state (client project data) in a way that is not directly bound to ladish project. * Import/export operations, as opposed to save/load. Save/load operate in current system and may cause saving data outside of project itself (external storage). Import/export uses/produces "tarball" suitable for transferring session data over network to other computer or storing it in a backup archive. * Hierarchical or tag-based organization of projects. * List of JACK applications. Applications are always started through ladish to have restored runtime environment closer to one existed before project save. * Distributed studio - network connected computers. Netjack configuration is part of the studio and thus is saved/restored. * Collaborate with the X11 window manager so window properties like window position, virtual desktop and screen (multimonitor) are saved/restored. -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

14 years, 7 months

A sound decision

by A. C. Censi

http://www.itwire.com/opinion-and-analysis/open-sauce/36698-from-windows-to… >From Windows to Linux: a sound decision Some excerpts: Five years ago, when Geoff Beasley decided to move his sound studio business from a Windows-based one to a Linux-based setup, he had one simple bit of logic driving him: things could not be worse under Linux. ... "There's a great difference between working with commercial software and Linux," says Beasley. "One is the speed at which things get fixed - it is simply amazing. Another thing is that though I am always running software which is in a constant state of development, it is incredibly stable. It is not possible to get fixes at this speed from commercial vendors - the guys I work with are driven by the sheer elegance of their software and its flexibility. And I am constantly amazed at what I can do with my limited knowledge." ... Beasley's set-up: SYSTEM SOFTWARE All 5 of the production machines have the following subsystem: Arch Linux system custom 2.6.31,6-rt19 kernel with RT preemption (essential for Xrun avoidance - click and pops) Desktop consisting of openbox, Adeskbar and pypanel. Display manager is Slim AUDIO jack2-svn (contains netone; which is netjack1 within jack2) Qjackctl-svn Rtirq (RT pci priorities for sound cards; also essential for Xrun avoidance) LinAS LinAS is the audio master machine. It hosts 4 Hoontech C-Ports (ice1712-based chipset) in an Alsa multi-array providing 40 channels of audio to the other machines via 'netone'. jack is running with 2 periods @ 48kH and 64 frames giving a 'round-trip' latency (in and out) of 2.66 ms . Can be run @ 32 frames (half the latency) but the samplers struggle at this low a frame rate. Uses Gjacktransport to control the jack transport here and therefore the netone slaves via jack transport. LinDAW The Digital Audio Workstation hosts 'Ardour' as the main DAW software and also Mhwaveedit and Audacity for audio editing, Qjadeo for synchronous video playback with Ardour, K3b & GDC Master for CD mastering. LinSeq The midi sequencer machine. Runs MusE 1.01-svn and Linuxsampler with the Fantasia (java) frontend. Magic. Mscore is the Linux music scoring program, started by the creator of MusE, Werner Schweer. LinSampler Uses the program fst (free software studio) by Torben Hohn to run vsti's (virtual studio technology instruments) under wine. The two I run are Kontakt 2 and Sampletank 2. Both work 100 percent maybe better than under Wine. LinVS This is the 'Video Server" This one specialises in distributing video throughout the complex via webcams using 'Cheese' to mount them. Kdenlive and capture cards are used to take interviews of Composers and Performers for web-based content enhancement. Qjadeo is used to playback vision also piped throughout. LinFX Essentially hosts the Jc_Gui front end for Fons Adriaensen's Jconvolver. Using open source Impulse Responses. Gives reverbs to the mixing desk. -- A. C. Censi accensi [em] gmail [ponto] com accensi [em] montreal [ponto] com [ponto] br

14 years, 8 months

Made with <linux

by teza

Hi all a quick blues made with traverso rakarrack calf compression audacity fender strat squier on eeepc 1OO5HA under Ubuntu Studio 9.10 Listen here: http://www.docmorzy.info/lucidlynx/teza-eeepc-blues.ogg Regards Teza

14 years, 8 months

Album made with Linux - Kuun valtakunta

by Tapani Sysimetsä

Hello, I have the pleasure to tell that my first album Kuun valtakunta ('The Empire of the Moon') is finally ready: http://tapanisysimetsa.bandcamp.com/album/kuun-valtakunta It includes some new songs as well as remixes of older tunes, which you may have heard before. I used Ardour, QSynth, ZynAddSubFx and Hydrogen with native Linux plugins, sometimes also others such as Freebirth and Creox. Thanks to Markku Koskinen for playing drums and violin, and Jaakko Karjula for drums. Mastering was done by Joona Lukala. I don't know what setup he used, but I think it was a good idea to let someone with fresh ears and good skills to do the mastering. Cordial thanks to Linux audio community for providing great applications and constructive feedback on the demo versions! I hope you enjoy... :) Tapani P.S. Downloading should work also without Flash. If not, please drop me an e-mail.

14 years, 8 months

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Linux-audio-user February 2010