Linux-audio-user March 2009

linux-audio-user@lists.linuxaudio.org

120 participants
123 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

Seq24 and jack-transport with Jack-1.9

by go music

This is for all those who might have tried seq24 with jack2. Attached is a patch containing modifications made by Stéphane Letz, the developer of jack2 who was so kind to have a look into the seq24 code yesterday. In the original setting, seq24 was not able to do a proper client connection and failed working with jack2 transport. It also fixes the deprecated call to jack_client_new. It applies to src/perform.cpp , hope it works as a patch... Thanks very much Stéphane. Cheers Frank

15 years, 4 months

Audio Hardware Recommendations

by Christopher Stamper

Hello all, I'm thinking about finally upgrading from my cheap soundblaster+mic to something of a little higher quality. I'm thinking along the lines of an external firewire/usb box and some kind of low-cost mic. I'd use it primarely for vocals, but I'd like the recording interface to support 2-channel, for possible some piano recordings/etc. I also don't want to spend very much, and would plan to get it used, on ebay. What do you guys use or recommend? Thanks! -- Christopher Stamper Email: christopherstamper(a)gmail.com Web: http://tinyurl.com/2ooncg gTalk: http://tinyurl.com/6e359r Skype: cdstamper

15 years, 4 months

Goed nieuws! Especially for the Dutch speaking: special linux audio forum part on homerecording.be !

by rosea grammostola

(Nederlandstalig linux forum gedeelte op homerecording.be >>> http://www.homerecording.be/forum/f43/ !) Hi, Thanks to the LAU mailinglist, I've discovered the possibilities of Linux for producing music in the last two years. But it seems I'm a bit of a special case in The Netherlands... most people seems to use Mac or Windows for music production, even people who prefer Linux as their main OS... To change it a bit, I helped people on Linux forums and wrote a dutch tutorial for Qjackctl and Ardour. I also posted my enthusiasm and knowledge on 'not-linux' forums... got a lot negative reactions, but not on www.homerecording.be. The had a open mind for opensource software... and after posting some posts there, they have decided to open a special subforum for making music on Linux! :) (Windows and Mac can't say that...) It would be cool if dutch speaking people will support this forum part by taking a look at it reguarly and to post some messages, moreover to help people with making music on GNU/Linux! You can find the forum here: http://www.homerecording.be/forum/f43/ CU there! \r

15 years, 5 months

alsa midi to jack midi

by andy baxter

hello, I've been looking at ingen ( http://drobilla.net/software/ingen/ ). Had some problems getting it to build, but the trick turns out to be to install liblo and libsoup bfore you configure the build. It's a really nice bit of software - a GUI modular synth that lets you design and save simple patches which can then be used as building blocks for more complex ones. The main problem I'm having with it so far is that it doesn't seem to understand alsa midi - only jack midi. This is difficult as I don't have or know of any midi programs (particularly a virtual keyboard) which produce jack midi signals. Does anyone know of an easy way to convert alsa midi into jack midi and vice versa? andy

15 years, 5 months

[ANN] Nama agile recorder-mixer version 0.98

by Joel Roth

Another version of Ecasound/Nama is available at CPAN for your multitrack recording pleasure. We are approaching a 1.0 release! Here are the newest changes: - Track soloing - Documentation rewrite - Pager for long text listings - Many bug fixes - Simplified build script (preprocessing really) facilitates source browsing/tinkering And a feature list: - Based on Ecasound, a stable, full-featured audio processing engine. - Very flexible template-based signal routing allows for multiple buses. Possible to simultaneously record and mixdown a live performance. - Tracks + can be mono, stereo or any desired width + volume/pan with any number of effects + signal sources from soundcard or JACK clients + multiple WAV versions per track + playat, reverse, select, audioloop - Tk based GUI + main window and effects window + auto-hinting of LADSPA plugin parameters range and linear/log + stable, lightweight + no dialog boxes considered a feature - Full-featured text UI + Executes Ecasound commands, Nama commands, shell commands and perl code + multiple commands per line + help for commands and plugins - Automated connection to JACK clients - Marks - Looping over entire chain setup between designated marks - Full diagnostics with dumping of all data structures - Persistent settings stored as browsable YAML - Per-project configuration files - Small codebase compared to other projects, ~7K lines - Active development - Hackable, extensible Caveat! We're having some difficulties compiling Audio::Ecasound, on which Nama depends, for x86-64. The easiest way to install Nama is from CPAN: cpan Audio::Ecasound::Multitrack If you'd prefer to install from sources, you can copy the repository thus: git clone git://github.com/bolangi/nama.git Build instructions are found in the README. I'm interested in any comments, bug reports, feature requests, etc. you may have. Regards, -- Joel Roth

15 years, 6 months

Join the Debian Multimedia Team! (to improve the state of Linux audio)

by Grammostola Rosea

Hi, Many of the people of the Linux audio community uses Debian or a Debian based distro (Ubuntu (Studio), 64Studio, Musix, Sidux, Mepis etc. etc.). Most of those distro's uses and rebuild the packages of Debian (unstable). There are a lot of audio packages build by the Debian Multimedia Team, but there are also a lot which are not in Debian yet (and so also not in Ubuntu (Studio), Sidux, 64studio etc.) So there is a need for more people who wants to contribute to the Debian Multimedia Team. Again, you don't have to be a plain Debian user to contribute or to take advantage of it. You will help to improve the state of Linux audio in general (at least the Debian based distro's and their community), which will be good for us all, but also for newbies who are not able yet to build all the packages themselves to enjoy all the nice things Linux audio has to offer. Also note that it is possible to build Debian unstable packages on other distro's then Debian itself (search for Pbuilder on the Internet for instance)! It will also be good for the Linux audio developers and their software. It would be more easy to install, use, test and enjoy the software by the Linux audio community! There are a lot of people these day who has an own (PPA) repo. This is ok, (and maybe it will be a good thing if the Linux audio developers make their packages available as much as possible in a Debian unstable repo/package, so it can be used on Debian and it is easy to rebuild it for Debian based distro's), But to bundle forces and to get safe, stable and quality packages, joining the Debian Multimedia Team will get much better quality packages and you will help far more people then having your solo private repo... *Why the Debian Multimedia Team? * 1) Because they want to improve Debian for music production! 2) Debian has an flexible, fast and easy package management 3) A lot of people use Debian (based) distro's, Debian itself, Ubuntu (Studio), 64studio, Sidux, Mepis etc. 4) You will learn to build quality packages 5) You don't have to become a Debian developer (DD), you can just become and stay a package maintainer. *What can I do?* 1) Build or improve packages for the Debian Multimedia Team. It's recommended to maintain packages you use yourself often. 2) Report bugs and wishes 3) Join the Debian multimedia team mailing list: http://lists.debian.org/debian-multimedia/ *Where can I find more info?* Wiki: http://wiki.debian.org/DebianMultimedia Packaging: http://wiki.debian.org/DebianMultimedia/DevelopPackaging Existing packages which needs help: http://wnpp.debian.net/ Debian New Maintainers' guide: http://www.debian.org/doc/maint-guide/ (!) Bugs: http://bugs.debian.org/cgi-bin/pkgreport.cgi?which=maint&data=debian-multim… It would be great if you choose one package which you uses a lot and maintain it for the Debian Multimedia Team! It would improve the quality of Linux audio and it will help the whole community! Kind regards, \r ps. If you like to join, please subscribe to the Debian Multimedia Team mailinglist and ask for more information: http://lists.debian.org/debian-multimedia/

15 years, 6 months

jconv, linuxsampler, and ingen

by alex stone

OK, back home again, with the feet under the desk. I have a question. I've been having a terrific run with Ingen, and slowly building up an orchestral template. Can i open jconv and linuxsampler in Ingen as either plugins, or 'recognised' apps? I'm not sure of the means of inserting command line apps in Ingen, so it may already be possible. I start both Jconv and Linuxsampler (with templates) from the command line by default these days, so a means of inserting a 'command line plugin' in Ingen might prove useful. (or not as the case may be) The intention is to build a series of 'layers' for each app and associated ports, all routed to the top 'master' view. If i can start Ingen, and load the saved patch file, then i hop that everything will start, including templates, in one go. Any help with this, or good reasons why it's not feasible, would be appreciated. Alex. -- Parchment Studios (It started as a joke...)

15 years, 7 months

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Linux-audio-user March 2009