Linux-audio-user January 2007

linux-audio-user@lists.linuxaudio.org

187 participants
180 discussions

[linux-audio-user] asoundrc / multi error -- "Channels count non available"

by reuben firmin

As part of my experimenting to get both of my cards playing the same stream, I defined a configuration in asoundrc using the multi plugin, per the docs here http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html The complete asoundrc follows. Testing using aplay -vD XXX myfile.wav, where XXX is the pcm name, usb, desktop and default work fine; however, multi and ttable both give an error: aplay: set_params:906: Channels count non available What does this mean and how can I fix it? Thanks Reuben ---- pcm.usb { type hw card 1 device 0 channels 2 } pcm.desktop { type hw card 0 device 0 channels 2 } pcm.both { type multi slaves { a { pcm "desktop" channels 2 } b { pcm "usb" channels 2 } } bindings { 0 { slave a channel 0 } 1 { slave a channel 1 } 2 { slave b channel 0 } 3 { slave b channel 1 } } } pcm.ttable { type route slave.pcm "both" ttable.0.0 1 ttable.1.1 1 ttable.0.2 1 ttable.1.3 1 } pcm.!default { type plug slave.pcm "usb" }

19 years, 1 month

[linux-audio-user] absynth sound?

by James Stone

Hi everyone, I was just wondering if it is possible to emulate the sound of absynth under Linux, maybe with a pd module or an om patch?? I remember from back in the day when I used Windows (maybe 4 years ago now..), it had a really unique sound. I haven't really heard anything like it in Linux, and I am not really sure how it worked.. I know it would be possible to run the vst with libfst, but I would really prefer something native (excuse the pun!!) Impossible?? James

19 years, 1 month

[linux-audio-user] Fedora 6 x86_64 short report

by lanas

Folks, Here are my results/impressions after trying Fedora 6. Here's the machine ------------------ AMD Athlon(tm) 64 X2 Dual Core Processor 4600+ 4 GB RAM MSI K8N Neo4 SLI board NVidia 6600 Viewsonic VP211b 21.3" TFT screen Fedora 6 x86_64 Fedora stock Linux kernel (no real-time additions) KDE desktop In short -------- I got jack going using qjackctl, then I can fire up ZynAddSubFx (hey, no joke about heaven and hell fire here !), plug in the Axiom 25 and record a few lines using Seq24. Even Ardour 2 seems to accept some multitracking, but default colours are not that nice (can be customized I think). Jamin shows up nicely but I haven't tried it yet. LADSPA plugins works. Hydrogen works. Haven't tried Fluidsynth yet. Warning: I don't know what xruns are and undoubtly I would if they'd pop up and interfere with proper operation. But so far I haven't seen any. How it was done --------------- 1) Installed Fedora 6 x86_64, specifying/adding KDE desktop in the way. 2) Got NVidia beta driver (and added livna) rpm -ivh http://rpm.livna.org/livna-release-6.rpm yum --enable livna-testing install kmod-nvidia Finally I get real 1600x1200 resolution. SuSE 10.0 couldn't do it. I gather there's now a open source Nvidia driver by the splash screen. Is this made in collaboration with Nvidia ? 3) Adjusted access to priorities by adding this to /etc/security/limits.conf: # Added for audio * - rtprio 99 * - nice -10 * - memlock 4000000 BTW, I read that the above is an insecure configuration. So, some finetuning could be done with that. There's an active Fedora Firewall, as well as SELinux, so maybe this is not as critical as it sounds. I'd appreciate any input on this. 4) Added CCRMA rpm -Uvh http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/6/x86… 5) Using kyum (added package right after install), got a handful of packages. 6) Have some fun, hopefully, and then some. Various notes ------------- With these settings I did not see any problems so far with the little things I did in playing and recording mainly with qarecord. A note on Beryl: it looks nice, with the windows looking like wet slices of bread thrown in the wind, but couldn't try it with the audio stuff as of today. I have the impression that it'd work. kyum is nice since it's quite straightforward. It's easier now to get audio going. I wouldn't be surprised that in the very near future there'll be a merge of CCRMA in such a way that it'll be a seemless integration to Fedora. Is it me or is the sound better ? Previously I was using on the same machine CCRMA in 32-bits mode. Subjectively I now find that Zyn sounds and their reverbs are sounding richer. Could this bit a by-product of 64 bits processing ? Pet peeves ---------- - No Rezound in sight at the moment - will have to give a try at compiling it - Fedora obstinates itself at trying to configure some eth2/sky2 device which has the net effect of throwing the boot sequence in text mode since that's not possible. - Beryl has worked _once_ (eg 'beryl-manager' from a console) but launching it later after reboot does not work. - Some minor issue with init of the eth0 device but this could very well have to do with the MSI K8N Neo4 board itself since SuSE 10.0 had a similar problem. Hoping this was somewhat interesting, Cheers, Al

19 years, 1 month

[linux-audio-user] Sharing a happy moment

by Ken Restivo

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I was mystified why I was still getting xruns even though I have an ingo kernel, a core duo CPU, a firewire audio interface, and tons of RAM. Then I noticed that the Trouble tended to be worse when recording guitar, or while mixing down. Then I noticed that wiggling the mouse made the problems go away. Aha! sudo rmmod cpufreq_ondemand sudo rmmod freq_table sudo rmmod iTCO_wdt Problem solved :-) No more xruns, at least so far. - -ken -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFFqfuve8HF+6xeOIcRAihuAKDetPONbMl15tRmkiCc2YPeWJvJlgCcDjuD +zXzKZ0Cu6g7VEkqbiL4hIQ= =tRW6 -----END PGP SIGNATURE-----

19 years, 1 month

[linux-audio-user] jack.plumbing segfault

by Ken Restivo

jack.plumbing is giving me segfaults shortly after launch. I've attached an strace. I got no backtrace in gdb, usually don't with SIGSEGV's anyway. And I dunno how useful it would be to run a process that talks to jack (realtime, low-latency) under GDB anyway. My .jack.plumbing is also attached just for fun. -ken

19 years, 1 month

[linux-audio-user] Re: Fedora 6 x86_64 short report

by Kjetil Svalastog Matheussen

Fernando Lopez-Lezcano: > > On Fri, 2007-01-12 at 19:01 -0500, lanas wrote: >> 3) Adjusted access to priorities by adding this >> to /etc/security/limits.conf: >> >> # Added for audio >> * - rtprio 99 >> * - nice -10 >> * - memlock 4000000 >> >> BTW, I read that the above is an insecure configuration. So, some >> finetuning could be done with that. There's an active Fedora >> Firewall, as well as SELinux, so maybe this is not as critical as it >> sounds. I'd appreciate any input on this. > > It all boils down to who can use programs that run with realtime > priorities and whether you trust them. The above conf (which I use) > gives access to everybody - meaning anybody can potentially hang the > machine, either through buggy software, a mistake or intentionally. > > You can of course restrict things a bit more by using unix groups and > only give access to a group of users (which you presumably trust...), > then that's more "secure". Still, allowed users can hang the machine if > they want. > > You could also restrict the range of priorities users can use, add a > watchdog program that runs at a higer priority and kills or downgrades > the scheduler to SCHED_OTHER of processes that are hogging the cpu - but > IMHO things get complicated too fast, and sometimes you may _want_ to > hog the cpu :-) > Except for that want-to-hog-the-cpu scenario (which is very uncommon at least for audio usage), I would say that using either rt_watchdog or (especially) das_watchdog is a very good solution to the above mentioned problems. I don't know whats getting so complicated...

19 years, 1 month

[linux-audio-user] abusive audio, will it blow up the PA?

by Atte André Jensen

Hi I've been playing with fastbreeder, and am extremely pleased with the truly wonderful noises it can do (thanks Dave!!!!) However looking at some of the results in mhwaveedit it seems that it's injected with electrical/non-acoustic phenomenons like dc-offset and low frequencies. I'm wondering how a home stereo and/or a large PA would react to such sounds? Is there anything I should/could do to prevent black smoke from coming out of amplifiers and speakers (ears would be ok :-))? Or should I simply not worry. I put a sample at http://atte.dk/download/fb_abuse_groove_3.ogg if someone wants to have a look for themselves what I'm referring to... -- peace, love & harmony Atte http://www.atte.dk | quintet: http://www.anagrammer.dk | compositions: http://www.atte.dk/compositions

19 years, 1 month

[linux-audio-user] status of ams

by Atte André Jensen

Hi I just rediscovered ams. What a nice synth! Actually I started implementing some of the few things I feel is missing. However it seems to me that nobody's using, at least the mailing lists are totally dead. So: 1) Anyone using it? 2) If not, why? Don't need/understand this type of synth? Use something else (what) instead? Technical reasons/limitations? 3) If you ever tried what did you love about it and what did you hate? Did you find user friendly? Did it perform well? 4) To rephrase 2): If the project was resurrected, what would it take for *you* to start using it. 5) Anyone (other than me) looked inside the code and interested in discussing certain aspects of that? Maybe even a joint effort to repair the quirks in ams? Finally let make it clear that I don't have the time or knowledge to take over development of ams. But I'm interested in helping with bringing it to a state where it's a bit more usable... -- peace, love & harmony Atte http://www.atte.dk | quintet: http://www.anagrammer.dk | compositions: http://www.atte.dk/compositions

19 years, 1 month

Re: [linux-audio-user] Outputting same sound source to multiple cards simultaneously

by Sampo Savolainen

Quoting reuben firmin <reuben.firmin(a)gmail.com>: > With adequate buffering I think this shouldn't be a problem in my use > case > -- the speakers connected to the wireless device will be in a different > room. You're not saying that a soundcard will get so far behind that the > buffers will fill up, are you? Both soundcards are designed to output in > ~"real time" after all. Buffering doesn't fix the problem at all. It will maybe postpone it, but nothing more. Being "out of sync" translates to the fact the soundcards will consume samples at different speeds. While the other one will consume 44101 samples per second, the other one might consume 44030 samples per second. Because of this, the sound emitting from the soundcards will drift apart. Also, the pitch of the sound will differ. Example: Just after 10 seconds, the 1st card in my example will be emitting sample 441010 (44101 * 10), and the other card will be emitting sample 440300 (44030 * 10). This means that if the original audio has been recorded at exactly 44100, the cards are already 0.016 seconds apart from eachother! (44030 is an example of a really crappy clock chip on a card, but it's not unheard of) Let me re-iterate: Without syncing the soundcards, this /will/ happen. This is not a legend or some far-fetched possibility that people speak of but which really never affects real life. Just imagine two wall-clocks. Can you really expect them to keep the exact same time over years of continuous running without anyone re-setting them? Sampo

19 years, 1 month

[linux-audio-user] CME Bitstream 3X

by Michael Pacey

Hi List, Does anyone have any experience with this Midi control surface? They claim linux support for their configuration software. http://www.arbiter.co.uk/cme/products/cme_bitstream_3x.htm The official page is here, but it's very slow (or stopped): www.cme-pro.com/products-list/product-Bitstream3X.html I'm looking for something with lots of knobs to tweak parameters in DSSI softsynths hosted in Rosegarden, does anybody have any recommendations? I believe Rosegarden will pass-thru and record the midi events, but I have no proof... I'm thinking of both live tweaking and recording. Thanks! -- Michael Pacey

19 years, 1 month

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Linux-audio-user January 2007