Linux-audio-user November 2009

linux-audio-user@lists.linuxaudio.org

160 participants
143 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, 8 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, 3 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, 11 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.

14 years

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, 4 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, 7 months

Re: [LAU] which audio synthesis environment?

by cunnilinux himself

>> But actually you guys lost me a bit, what is so important about the plugin paradigma? if you have quite a lot plugins with good presets, you actually don't have to learn anything. just try this and try that, and you've done. -- sex, bike, open source!

14 years, 9 months

Two (free) albums (free) tracks available on archive.org

by Aurelien

Hello, (pre-prost-scriptum: improtant informations are quite below!!!) I think I didn't any announcement here before, but the label I created some years ago, and work in by now, released two albums fully realized with free softwares (on a Debian GNU/Linux distribution) in 2008: Sebkha-Chott - Nigla[h] / Tapisseries Fines en XXX Strips et LXX/X Trompettes Sebkha-Chott - De la Persistance de la Mythologie Chottienne en ??? Vélos Both those albums are distributed internationally by the label Muséa Records, and you may find them, freely downloadable and/or to purchase here: www.ammd.net/productions/productions.php and at a lot of other places on the web. You also might find numerous review of those albums, in Google, and so on. OK, that's it for the presentation. Actually, it took us a lot of time, but we finally sent the whole tracks of the 14 multitracks session (in ardour) and the session them selves on archive.org, so that you can use them freely. it's quite big big big sessions, as Sebkha-Chott used to be 8 people at that time and invited something like 25-30 guests to play with. So you might find something like 100-150 (even 180 on one of them, if I remember well) tracks by song. For Nigla[h], there are two options: we did tarball of each ardour sessions directory and we also bounced every tracks in one file, so that you can manage to use them in another multitrack editor. We then thought about it, and had the conclusion that it was a really hard work for us to do all these bounces and exports, and finally it essentially was destined to people using proprietary softwares. So, for De la Persistance, you will only find the tarballs, as we think we have to "encourage" people using ardour, or, if they prefer ecasound or whatever, they probably will be skilled enough to convert the xml file into something suitable for another soft, or a bit worse, they always might do all that export stuff and so on. The archive.org links are listed on www.ammd.net/productions/productions.php Hope you will enjoy it. All our further productions will follow the very same line (there will be one recording session in November for a pop-prog-rock band), and we also aim to release some very huge instruments sample base, as we have the luck to possess a very good studio, and also very good instrument, including, for example, a true Harpsichord, as one of us do build Harpsichords! See you. Aurélien - AMMD www.ammd.net PS: For off-list further informations, please write to orlATammmmmmmd.net, which is my pro mail, which I don't want to subscribe on this list (and ammd does spell with two 'm' only! ;) -- Aurélien

14 years, 9 months

Arch Linux realtime kernel?

by Jonathan E. Brickman

Is there a standard or semistandard realtime kernel available for Arch Linux? J.E.B.

14 years, 9 months

Cooking with Gas

by Folderol

This is a set of ZynAddSubFX tutorials produced by the man himself. I can recommend them all, and be prepared to be amazed :O http://www.youtube.com/user/zynaddsubfx -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

14 years, 10 months

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Linux-audio-user November 2009