Linux-audio-user September 2009

linux-audio-user@lists.linuxaudio.org

143 participants
148 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.

2 years, 5 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

9 years

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/…

13 years, 8 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

15 years, 1 month

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!

15 years, 6 months

instructional videos ?

by Dave Phillips

Greetings, As many of you know, the Linux Journal has been running video presentations in lieu of some written articles. They've asked me to make a few, so I thought I'd ask on this list to find out what topics LAU folk might want to see illuminated via video. Feel free to suggest any relevant topic, whether in the production realm or desktop entertainment. FYI: Current systems running here include JAD 1.0, 64 Studio 2.1 and 3.0b, and Ubuntu Jaunty. I finally got a copy of a recent Fedora and will install Planet C on one of these machines too. So, what would you like to see from Studio Dave ? Best, dp

15 years, 10 months

Laptop specs

by laurence alexander

I use Ubunutu Studio for audio - Rosegarden, Hydrogen, AMSynth, Alsamodular synth, audacity, time machine, zynaddsynth etc - on an 8 year old laptop. I am having overheating problems and want to upgrade to a new machine. Any advice for minimum specs to be looking outfor. E.g. is a 7200rpm hard drive necessary? Should I go for dual core? Trying to spend around £300. Thanks

15 years, 10 months

Advice on Multiple Volume Settings

by Kenneth Jacker

I want to ask the "experts" on this mailing list a question I've had for years. It involves "best practices" for the multiple volume settings available on most computer systems ... Say I am playing an audio stream from 'last.fm'. The way I see it, there are *four* different possible volume settings: "line" (e.g., PCM) volume, application (e.g., Rhythmbox, TVTime, ...) volume, mixer "master" volume, and speaker volume. I would guess that the last (speaker) volume should be set (dynamically when needed) to whatever is currently most appropriate for the listener. But what about the other three? Should they all be set at 50%? If not, what other values should be used? Can anyone give some guidelines? Thanks for your comments! -- Prof Kenneth H Jacker khj(a)cs.appstate.edu Computer Science Dept www.cs.appstate.edu/~khj Appalachian State Univ Boone, NC 28608 USA

15 years, 10 months

Recording of my new band.

by Loki Davison

Hey all, Thanks everyone for the help getting the recording stuff for my band. We have now recorded quite a bit of stuff, just simple jam recordings in Ardour. Here is one of the covers we did, of The Magnetic Fields. Using 3 mics, 2 on guitar in x-y and one on vocals. Tell me what you think of the vocalists singing too, and well, my guitar playing ;) http://yoyo.its.monash.edu.au/~loki/The_Turncoats-The_Book_Of_Love.mp3 Loki

15 years, 11 months

which audio synthesis environment?

by Grammostola Rosea

Hi, How to choose a audio synthesis environment? Why and when Pd, Supercollider or Csound? And why do you use Chuck Atte? Just for orientation... \r

15 years, 11 months

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Linux-audio-user September 2009