Linux-audio-user June 2009

linux-audio-user@lists.linuxaudio.org

140 participants
111 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

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

[ffado] Recommend FireWire Hardware from the Following

by Ray Rashif

It's that question again, and it's here for you to answer and gain cookie points! Here's my array of the chosen ones: ECHO AudioFire 4 [[ http://www.echoaudio.com/Products/FireWire/AudioFire4/index.php ]] Edirol FA-66 [[ http://www.rolandus.com/products/productdetails.aspx?ObjectId=731&ParentId=… ESI QuataFire 610 [[ http://www.esi-audio.com/products/quatafire610/ ]] Focusrite Saffire [[ http://www.focusrite.com/products/saffire/saffire/ ]] That was narrowed down from [[ http://ffado.org/?q=devicesupport%2Flist&filter0=&filter1=&op2=OR&filter2%5…. All these satisfy my need for mobility and at least 2 DI and MIC inputs. >From what I know, they pretty much cost about the same, or within 100-200 bucks apart. * All except the Focusrite are hybrid inputs, so it has the upper hand there. * Only the Focusrite has onboard DSP effects, BUT unsupported on Linux (ffado) * Only the ESI officially mentions support for Linux So here's the homework for you guys: Reorder the list in decreasing order of merit. Conditions include (in order of decreasing importance): * Preamp Quality * Linux Support Extent * Beauty * Portability If that one's too tough, then just pick 1 (or 2/3 depending on which of those you have firsthand experience with) =p Thanks and good luck!

15 years, 3 months

Best realtime audio dstro for Eee

by Norval Watson

Hi y'all, I want to install a realtime audio distro on my new Asus Eee 901. I need a 2.6.29 realtime kernel or higher to support the hardware on my Eee. I have got the 2G RAM (haven't swapped it in yet). AFAIK, options include: DebianEeePC http://wiki.debian.org/DebianEeePC ArchLinux http://wiki.archlinux.org/index.php/Asus_Eee_PC_901 Eeebuntu http://www.eeebuntu.org/ Indamixx USB stick, when it's available, (and it's not free) I have been using Debian unstable for some years so I'm most familiar with that. Any suggestions welcome, particularly regarding optimizing the kernel. TIA Norv Need a Holiday? Win a $10,000 Holiday of your choice. Enter now.http://us.lrd.yahoo.com/_ylc=X3oDMTJxN2x2ZmNpBF9zAzIwMjM2MTY2MTMEdG1fZG…

15 years, 3 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, 3 months

New Music

by Bill Allen

Here are a couple of new songs that I've done recently with Ardour, Hydrogen, ZynAddSubFX, AMS, and some ladspa plugins. They are pretty different from each other so if you don't like the first try the other :) http://www.k2bea.org/Home/The_Tree_of_Life.ogg http://www.k2bea.org/Home/Reflections-Apples-low.ogg Best regards, Bill

15 years, 3 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

Audio Distribution Proposal...

by jrogers

> Message: 28 > Date: Mon, 01 Jun 2009 09:54:22 +0300 > From: Asmo Koskinen <asmo.koskinen(a)arkki.info> > Subject: Re: [LAU] ubuntu realtime. I did not take quotes from the following link because the whole thing deserves a (re)read https://lists.ubuntu.com/archives/ubuntu-studio-users/2009-April/004507.html This bummed be out so I had to quote this: > Almost down for the count, Cory K. The note was a plea for help so I would like to see what we can do. There are so many things to discuss and so many possible directions to go in Just thinking about it can be overwhelming Free (not free beer, but freedom) is wonderful, but it ironically can be more paralyzing than confinement, so let me start with a simple and self limiting proposal: I tried to write this list a few times, and every time it got too long and complicated. At the risk of being flamed here is my simple list: - Manual install (like arch Linux) is fine and probably preferred. (manual is fine, but complete default instructions would be needed) - specific hardware (i.e. motherboard, video card and audio interface) is fine - most/all of the popular audio apps with a kernel that combined to create a system that was extremely stable and had reasonable latency (less than 10ms? Or maybe less than 7ms? What ever can be done with reasonable and reliable settings?) - I would donate at least $100 per year (If a thousand people joined me that would be $100K Could one person full time, or several people part-time sign up for that? - I would donate a few years in advance say three years (If this would help someone/some-few decide to do this) - I would also help out. This assumes the individual or small core team would dedicate sufficient time to partition the tasks in a way that would facilitate widespread involvement. Questions: Ignoring resources (money, people, etc) is it reasonable to build and maintain such a distribution? Is $100k per year enough? If not how much is needed? Are 1000 users at $100 reasonable to expect? How about 2000 at $50? Or 500 at $200 (I would consider donating $200/year) Strike that If this existed today I would donate $200. I know that the conventional wisdom is that Linux audio is not for new Linux users but I think that is the root of the chicken/egg problem that we have here. A predictable, stable, reliable audio distribution may generate the support that the particular distribution (and Linux audio in general) needs to get to the next level. Can we prime this pump with a conservative but very useful distribution?

15 years, 4 months

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Linux-audio-user June 2009