Linux-audio-user May 2005

linux-audio-user@lists.linuxaudio.org

154 participants
186 discussions

[linux-audio-user] Please test the RT rlimits patch for audio

by Jody McIntyre

The RT rlimits patch (nice-and-rt-prio-rlimits.patch) has been proposed as a solution to allow audio users to run their applications with realtime priorities. While more complicated to configure, it's a much cleaner patch than realtime-lsm and it's likely to get merged soon _if_ enough audio users test it and confirm that it works. To encourage this, I have created a wiki page containing installation instructions, links to prebuilt PAM packages, etc: http://www.steamballoon.com/wiki/Rlimits If this works for you, I am collecting success reports. Please email rlimits-success(a)steamballoon.com . If you have any problems with it, LAU is probably the best place to ask for help. Unfortunately I don't have large amounts of time to spend helping people with this, so any help requests emailed to me directly may be deleted without a reply. Sorry. Thanks for testing! Jody

19 years, 7 months

[linux-audio-user] Dumb question regarding CMT's ambisonic plugins

by Ivica Bukvic

Hi all, I have been messing with the ambisonic plugins provided in the CMT ladspa collection. I am namely looking into a simple implementation of B-format 1ch->4ch encoder. The problem is that I am failing to figure out how to use this on a simple mono (non-encoded) sound input in order to control its diffusion over 4 channels. When running it via Ardour and sending it to 4 separate busses via this plugin, even though the x, y, and z coordinates do affect the output of the 4 channels, they do not conform to the expected 3,4,2,1 output (I presume these correspond to 4 speaker outputs, but I am also having doubts about this as well, so your help in understanding this better would be most appreciated). By now you can see that although I know a bit about ambisonics (namely theory), that I am quite a newb in this area, but for what it's worth I am eager to learn :-). The pd set of plugins pretty much work as expected but they are also designed differently, likely with discrete 4-8 output that can be then patched directly to main outs. In the case of ladspa plugins I am not even sure whether what I am getting is encoded version of a 4-channel stream that then needs to be decoded. Yet, when I tried having: mono sound-> b-format 1ch to 4ch encoder (LADSPA)->4ch to 4ch decoder (LADSPA) -> out That gave me bunch of garbage with two out of 4 channels consistently clipping, so this means that this is probably not the case either... So, to conclude I must be not using the CMT plugins properly and would therefore greatly appreciate it if someone would enlighten me. I am already aware of the theory behind the ambisonics, it's just that I am a bit puzzled how the CMT plugins (if at all) could be used with mono and/or stereo non-encoded streams in order to spatialize them in real-time. I would most appreciate a simple practical example as to how to do this (if such proves to be possible). Thank you very much! Best wishes, Ico

19 years, 7 months

[linux-audio-user] Building knob.pd_linux

by Wolfgang Woehl

Hello Frank, I hope you're listening in, this one is for you: You finally got me where you want us all to at least look once: I'm wading through pd pages on the net and building pd and externals. The stuff I see and hear there is awesome, well, like you always said. The hook for me was fwish (http://www.danslchamp.org/mrtof/code.htm). That I wanted to see. I tried a *lot* of things. Turned out that after building Gem, zexy, cyclone, Iemlib etc I needed fwish's relaxing images badly. I take it from pd-list that the nightmarish experience of getting and building pd stuff is a known feature. So I won't complain. But hey =:O Then I said to myself: "Something simple now for a change" and ran into your pd303 (http://footils.org/cms/show/19). Ha! Even the first steps are fun: Can't build knob.pd_linux (parse error "typedef struct _methodentry" from m_imp.h) The makefile points to pd source (I'm back to 0.37.1-devel) alright, m_imp.h and the others are there. The knob.pd_linux that you have included in http://footils.org/pd303.tgz loads. But pd says "knob.pd_linux: undefined symbol: iemgui_list" when it's supposed to do anything (although iemgui_list exists in src/g_all_guis.h). So now I need your help. I want the knob. I think the knob will rock. Will it? Thank you for all your stuff, btw. Wolfgang

19 years, 7 months

[linux-audio-user] MIDI keyboard recommendations?

by October

Hi all! New to the list! I am a music lover but know nothing about actual "music". I know computers and have been in linux for several years (Mepis debian for the last year and a half) and I have a relatively powerful desktop with an SB Live! Platinum that features MIDI in/out in the "live drive" portion. I'm searching ebay for good deals on a hobby level keyboard that will allow me to explore my musical ideas as well as provide a decent learning enviroment with which to actually *learn* how to "play" (should I find the time and ambition). Some of the google searchs I've read seem to be of the opinion that USB MIDI under linux is not yet ready for prime time. Would my live drive (with MIDI ports) suffice if this is the case? Should I be looking at add-on cards? What might be a good choice for a first MIDI keyboard on a hobby budget and what sort of flaming hoops can I expect to jump through in regards to getting drivers and such in place? I've been considering some of the Edirol products. Will all the extra knobs and sliders be useful under linux or this a waste of money? Any and all recommendations would be gladly appreciated! Thanks in advance, Jon Hoskins Washington State, USA ----------------------------------------------------------------------- In a world without walls who needs gates or windows? --unknown __________________________________ Yahoo! Mail Mobile Take Yahoo! Mail with you! Check email on your mobile phone. http://mobile.yahoo.com/learn/mail

19 years, 7 months

[linux-audio-user] RE: More Homemade Muzak

by LinuxMedia

>>>> Herky-Jerk (OGG audio file, 3.4MB) >>>> http://www.xscd.com/pub/music/herky-jerk.ogg >> I like that. Can I request a beat, though? > Drums are a real weak spot with me. I have a good sense > of rhythm and I always wanted to be a drummer instead > of a keyboard player (but my mom and dad forced me to > take piano lessons). I love Hydrogen but I always > feel that if I were to try to add a drum part it would > sound ultra-cheesy and unrealistic. When I actually have everything set up the way I want it and get ready to make music, I will probly eventually look into electric drum pads (or whatever you call them). I'm assuming they are all midi. Would midiable drum pads help to make it more musical for you (assuming one could use the drum pads to trigger sounds via midi and a linux sequence/sampler)? > On the other hand, I feel that if I were to START with > a drum part, it's metronomic nature would restrict or > prevent more fluid, expressive tempos for the rest of > the parts of the music. When I think of "starting with drums", I think of it as an exception to the rule, possibly as a way to inspire me to write new sounding music (instead of my usual approach of writing by playing my main instrument and accompanying it with my singing *then* adding drums). This way, starting with drums would actually be a creative thing to make things fresh and different. And if the Electric Drum Pads helped open up creativity, then maybe this approach may actually make things more creative for you. > In a live band (I was a professional > musician for about a dozen years), the drummer and ensemble > are all in "psychological sync" in a way, so that the tempo > fluctuations sound "tight" and realistic, yet human and > variable. That seems hard to achieve using software percussion Yeah... nothing beats a group of musicans that click and all adding their personal sound to one complete song. Just being with people and playing can inspire more creativity. Just a few thoughts. Rocco

19 years, 7 months

[linux-audio-user] Intel ICH6

by j.t.sledge＠comcast.net

Does anybody know of a linux distro that has the newer intel ICH6 SATA controller support built into it?

19 years, 8 months

[linux-audio-user] Suse 9.2

by Larry Troxler

Hi, I recently experienced the Great Hard Disk Crash of 2005, and am starting again with Suse 9.2. I see it has most of the great audio apps included, but of course some of these apps are probably out of date. My immediate problem seems to be that MIDI isn't working; If I run the test MIDI patch in pd, for example, nothing happens with either MIDI input or output, using the MIDI port on my Soundblaster PCI 512 card. Also, when running rosegarden, I hear nothing when I press the test tone button on the GUI for the fluidsynth DSSI. I do see that the /dev/midi* devices are there. I haven't yet updated the kernel or installed the realtime_lsm module, although I suppose this should have nothing to do with whether MIDI works. For the time being, I'm starting jackd as root, and running rosegarden and pd as root, using sux. If someone can suggest a place to start troubleshooting, it would be most helpfull. Thanks in advance! Larry Troxler

19 years, 8 months

[linux-audio-user] JACK Rack and MIDI key/CC binding

by Rob Fell

Hi all I couldn't find any documentation which describes binding MIDI keys/CC's with plugin parameters/bypass in JACK Rack. Can anyone explain how it's done (I assume it's implemented since it does have an ALSASeq port)? Does anyone have any experience they'd like to relate when using it with a control surface (I'm seriously considering the Behringer BCR2000)? thanks Rob

19 years, 8 months

[linux-audio-user] More noise I made

by james＠dis-dot-dat.net

There's a link to the music and a piece of drivel about how I work at http://blog.dis-dot-dat.net/ Comments are, of course, lusted after. Thanks for the load of your ears. James -- "I'd crawl over an acre of 'Visual This++' and 'Integrated Development That' to get to gcc, Emacs, and gdb. Thank you." (By Vance Petree, Virginia Power)

19 years, 8 months

[linux-audio-user] [ANN] Realtime Extension documentation for SND, and snd-ls V0.9.3.0

by Kjetil Svalastog Matheussen

The Realtime Extension for the sound editor SND consists of two parts: 1. The RT Engine - An engine for doing realtime signal processing. 2. The RT Compiler - A compiler for a scheme-like programming language to generate realtime-safe code understood by the RT Engine. Homepage: http://www.notam02.no/arkiv/doc/snd-rt/ Screenshot: http://www.notam02.no/arkiv/doc/snd-rt/screenshot.png ******************************************** Snd-ls v0.9.3.0 --------------- Released 19.5.2005 About ----- Snd-ls is a distribution of the sound editor Snd. Its target is people that don't know scheme very well, and don't want to spend too much time configuring Snd. It can also serve as a quick introduction to Snd and how it can be set up. Changes 0.9.2.0 -> 0.9.3.0 --------------------------- -Updated SND to v7.13 from 18.5.2005. Many important changes. -Fixed a small error in the installation script. http://www.notam02.no/arkiv/src/snd/

19 years, 8 months

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Linux-audio-user May 2005