Linux-audio-user March 2006

linux-audio-user@lists.linuxaudio.org

215 participants
309 discussions

by Gene Heskett

Greetings all; Has anyone a url where I might be able to purchase the expansion interface gizmo for an Audigy 2 value card? Thanks. -- Cheers, Gene People having trouble with vz bouncing email to me should add the word 'online' between the 'verizon', and the dot which bypasses vz's stupid bounce rules. I do use spamassassin too. :-) Yahoo.com and AOL/TW attorneys please note, additions to the above message by Gene Heskett are: Copyright 2006 by Maurice Eugene Heskett, all rights reserved.

18 years, 7 months

[linux-audio-user] Making Audio on Linux Just Work: (1) defining the goals

by Paul Davis

( LAU folk: this is an initial outline of an email I want to dispatch to the desktop-architects list in the very near future. Your comments are eagerly sought. Note that this section specifically seeks to avoid any discussion of implementations or specific approachs. I would like to fully flesh out the list of tasks ASAP ) Making Sound Just Work ------------------------ One of the "second tier" of requirements mentioned several times at the OSDL Portland Linux Desktop Architects workshop was "making audio on Linux just work". Many people find it easy to leave this requirement lying around in various lists of goals and requirements, but before we can make any progress on defining a plan to implement the goal, we first need to define it rather more precisely. DEFINING THE GOAL ================= The list below is a set of tasks that a user could reasonably expect to perform on a computer running Linux that has access to zero, one or more audio interfaces. The desired task should either work, or produce a sensible and comprehensible error message explaining why it failed. For example, attempting to control input gain on a device that has no hardware mixer should explain that the device has no controls for input gain. PLAYBACK - play a compressed audio file * user driven (e.g. play(1)) * app driven (e.g. {kde,gnome_play}_audiofile()) - play a PCM encoded audio file (specifics as above) - hear system sounds - VOIP - game audio - music composition - music editing - video post production RECORDING - record from hardware inputs * use default audio interface * use other audio interface * specify which h/w input to use * control input gain - record from other application(s) - record from live (network-delivered) compressed audio streams MIXING - control h/w mixer device (if any) * allow use of a generic app for this * NOTE to non-audio-focused readers: the h/w mixer is part of the audio interface that is used to control signal levels, input selection for recording, and other h/w specific features. Some pro-audio interfaces do not have a h/w mixer, most consumer ones do. It has almost nothing to do with "hardware mixing" which describes the ability of the h/w to mix together multiple software-delivered audio data streams. - multiple applications using soundcard simultaneously - control application volumes independently - provide necessary apps for controlling specialized hardware (e.g. RME HDSP, ice1712, ice1724, liveFX) ROUTING - route audio to specific h/w among several installed devices - route audio between applications - route audio across network MULTIUSER - which of the above should work in a multi-user scenario? MISC - use multiple soundcards as a single logical device

18 years, 7 months

[linux-audio-user] music made with free software

by Rik Baeten

Hey, You can listen to a song I made with free software: http://www.ikrik.org/music byebye, Rik

18 years, 7 months

[linux-audio-user] question about jackd/qjackctl options

by Josh Lawrence

Hello list, I've been going through the options available in qjackctl, and also the options mentioned here: http://www.djcj.org/LAU/jack/. I've noticed two options: soft mode -a (ASIO support) What's odd is that neither option is mentioned in the other's doc. For example, I cannot find a reference to ASIO support in qjackctl. Likewise, I cannot find an explanation for soft mode in jack's doc. Two questions: what is soft mode, and is ASIO support still supplied and useful? One additional question: is there a place that provides comprehensive explanation of jack's features and how to use them? -- Josh Lawrence http://www.hardbop200.com

18 years, 7 months

[linux-audio-user] Snare Synthesis

by Carlo Capocasa

Here's an incredibly simple trick I discovered to synthesize incredibly hard and groovy snare sounds... The typical THWACK that just makes the crowds move. You need nothing more than a noise source, one (yes one!) band pass filter and a flexible envelope. Hook up the source and your envelope and tune your snare with the band pass filters cutoff frequency and bandwidth (also known as CF and Q-factor). Then set up your envelope to have a "knee". If the volume graph for your typical snare envelope looks like this: | \ | \ | \ | \ |_______ Make it look like this | \ | \ | \ | \ | \ | \ |_______________ The psychological effect is that the listener is 'punched' towards the knee with great force, and then gently released, constantly keeping him or her in that gentle musical trance place, while still being an extremely man-moving sound. It's great to help induce that 'dance trance' we pop musicians are all looking for for our shows. Actually, you can get the same effect with an extremely strong compressor; however, with this little trick you do the same thing and use no extra CPU power. Carlo PS: ZynAddSubFX is a great way too implement this; use a Free-Mode envelope and add an additional 'point' for the knee.

18 years, 7 months

[linux-audio-user] regarding the 2nd Book Of Linux Music & Sound

by Dave Phillips

Greetings: My publisher, Bill Pollock, has been gently pressuring me to commit to completing the 2nd edition of The Book Of Linux Music & Sound. Unfortunately I'm in a precarious position to commit myself to the work. The first book nearly wiped me out, I'm not sure I can sustain the effort to bring the next edition to light. Nevertheless, I'm still interested in seeing this book through to completion. So I have some questions for the community : 1. Is there a real need for another book such as the The Book Of Linux Music & Sound ? 2. If so, would I be wise to ignore the 2.4 kernel series ? (It would make it easier to ignore material re: OSS/Free) 3. Would anyone be interested in co-authoring the book ? I've considered offering some chapters to certain people on these lists, but the issue of reimbursement gets sticky WRT royalties and other compensation. I made very little money from the first book, but money wasn't the true reward anyway, so perhaps there's a way to turn it into a community-based work. 4. Is anyone else already working on such a project ? I don't want to duplicate efforts. Btw, this is the last hurrah for this project. If I don't take it now I won't be taking it on at all. I have a life, it's pretty full, and committing to this edition would be a major disruption. I can guarantee that it would be the last book I'll ever write. I look forward to your comments and advice. Best regards, dp

18 years, 7 months

[linux-audio-user] Saving LADSPA FX chains in Ardour

by David Haggett

Hi list. I generally DI either my electro-acoustic or solidbody into a Terratec DMX 6Fire 24/96. I have managed to get really good latency (1.45ms) with the rt-lsm, and am now experimenting with effects chains in ardour. I've started to accumulate a number of useful sounds but they are all saved in separate sessions and I can't find any way of recreating them without writing down the settings and rebuilding them from scratch. Is it possible to export an entire effects chain for re-use in another ardour session? -- David Haggett

18 years, 7 months

[linux-audio-user] Mouthwork

by Arnold Krille

Hi all, yesterday I got back to my computer to do some music. The result is a bad little piece I uploaded here: http://dillenburg.dyndns.org/~arnold/node/308 Feel free to play and use it and have a nice weekend, Arnold -- visit http://dillenburg.dyndns.org/~arnold/ --- Wenn man mit Raubkopien Bands wie Brosis oder Britney Spears wirklich verhindern könnte, würde ich mir noch heute einen Stapel Brenner und einen Sack Rohlinge kaufen.

18 years, 7 months

[linux-audio-user] RE: [linux-audio-dev] regarding the 2nd Book Of Linux Music & Sound

by Ivica Ico Bukvic

> > > Need it always be so? Or can we get a little organized and greatly > > > improve the situation? My own opinion is that the community can do > this > > > with a little organization and motivation. Someone well-repsected and > > > experienced in documenting (e.g. Dave) could head the organization, > and > > > the publishing carrot would provide just enough motivation for many > > > people. Without the publishing carrot I think we would still benefit > > > from a little organization. > > > > Before anyone starts writing new documentation, what is most desperately > > needed is for someone to remove all the bad documentation out there (for > > example most of the ALSA wiki dealing with .asoundrc files and dmix) > > Yes, absolutely. Seems to me that what could solve both the issue of consolidation and of duplicate, mostly outdated documentation is generating a central website that provides one Wiki page for every pertinent topic, whether that be a specific software, system setup topic (i.e. ALSA), and/or distribution-specific how-to. The end-users and/or project devs/contributors could help generate the material, while Dave would assist in its shaping, so that it is translated into a well-structured learning resource and subsequently book-friendly format. Eventually, Dave could sum all this up into a book and everyone's happy ;-). If this proves to be something the LA community wishes to pursue, Linuxaudio.org could help foot the space. Just like the new home for LAD (lad.linuxaudio.org), we could have the aforementioned Wikis populated within the same domain (i.e. documentation.linuxaudio.org/pd, doc.linuxaudio.org/muse, doc.ardour.linuxaudio.org, or something along those lines), utilizing similar formatting, and therefore generating a kind of a reliable, uniform, and familiar interface for users, regardless of the topic they wish to pursue. FWIW, I am looking to do exactly this with one of my ongoing projects, simply because the scope of the project I am engaged in encourages feedback from as many artists as possible. Considering that anything associated with technology is an elusive target, books covering such topics are practically outdated as soon as they hit the shelves. Hence, the aforementioned approach IMHO may soon become the only reliable option if the author(s) wishes to generate content that is more time-resistant. This kind of an approach could also help speed-up publishing of subsequent editions--Dave could simply recompile project summaries from the aforementioned Wikis once per year and, publisher willing, release a new edition of the book for those who prefer to have documentation in a paper form (i.e. for teaching and/or reference purposes). Best wishes, Ico

18 years, 7 months

[linux-audio-user] Can't get rid of xruns

by Dominic Sacré

Hi, I'm trying to set up my Ubuntu Dapper system to work reliably with reasonably low latency, but I'm unable to really eliminate xruns. It works quite well most of the time, but sooner or later I'll inevitably get xruns, usually when starting/closing jack-apps, or sometimes when starting/stopping playback. My machine is an Athlon XP 3000+, with VIA chipset and 2 SATA disks. The sound card is an M-Audio Audiophile 2496, and my aim would be to run jack at 5.8ms latency (-r44100 -p128 -n2) or less. I already tried pretty much everything I could thinks of, that is: - Installed a realtime kernel (currently 2.6.16.1-rt11) - Used the nv display driver instead of nvidia - Switched PCI slots around so that the Audiophile doesn't share an IRQ with the graphics card (an IRQ solely for the Audiophile doesn't seem possible, it now shares an IRQ with a SBlive) - Changed filesystems from reiserfs to ext3 (/) and xfs (/home) I'm running jack at rtprio 70, and also set the sound card IRQ's priority to 99, but none of that seems to make a difference. I have latency tracing enabled, but I can't make head or tail of it, to me it looks like the xruns occur at random... Now I'm at a loss. What else can I do? Thanks, Dominic

18 years, 7 months

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Linux-audio-user March 2006