Linux-audio-user

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20661 discussions

[linux-audio-user] Patch to choose scheduler at runtime

by Joe Button

Thought people here might be interested in this story: http://kerneltrap.org/node/view/3366 It's about a patch that allows you to switch between CPU scheduling policies through the /proc interface. eg: echo sc > /proc/sys/kernel/cpusched/mode should switch to Con Kolivas' staircase scheduler. Haven't tried it myself but thought people might be interested. Joe

21 years, 4 months

[linux-audio-user] kernel2.6: realtime lsm and allcaps=1

by Antonio

Hi to the list, I've installed a Debian Sarge with kernel 2.6.6, jack 0.94 and realtime-lsm 0.1.1 to have the realtime capabilities for the normal user. The default is to set gid=<audio_group_gid>, but I'm not able to start jack from a user in the audio: $ jackstart jackstart: cannot get realtime capabilities, current capabilities are: =ep cap_setpcap-ep probably running under a kernel with capabilities disabled, a suitable kernel would have printed something like "=eip" Neither the any=1 parm does the job. If I reload the module with the allcaps=1, then I can start jack from a normal user. Am I missing something? Is not insecure to run jack via allcaps=1? Anyway, with the 2.6 series I've got a lot of xruns. I've read that maybe the problem is, instead, with the new version of libc. Someone knows more on it, and is there some workaround? Thanks, - Antonio

21 years, 4 months

[linux-audio-user] How to make MIDI works with linux

by reed

Hi all!!! I have this hardware: Roland E30 keyboard Creative PCI 128 Jackd Monitors left and right 1) I want to play on the keyboad and record the midi events to rosegarden. 2) I want to play rosegarden through PCI 128 that make the Roland speaker play my midi. Is it possible? I have jackd up and running. Thanks so much!! ste Stefano Cardo Debian DeMuDi GNU/Linux User

21 years, 4 months

[linux-audio-user] ogg confusion

by Atte André Jensen

I'm trying out oggenc under linux/unstable, but I'm confused! Using "oggenc -b 128" ends with a file with bitrate around 60-70 acording the the report printed by oggenc... -- peace, love & harmony Atte http://www.atte.dk

21 years, 4 months

[linux-audio-user] New Asus Ath. XP 2500 Delta 1010LT performance

by Russell Hanaghan

Okay.,,, So I bought this new box and have been working on getting it setup and stable for a few days now. When I run with Jack {.9.8.1 with Qjackctl 2.9} and Ardour {beta 17.1} at 48000khz I get mostly "pop" and crackle free operation in software monitoring (Which I have no choice to use as I'm using it as a live fx processor) But if I try to run at 96000 it pops and stuff even at higher intervals (512, 1024,etc). I guess I expected it should be able to do this no problem and I would get better fidelity as a result. What would the possible verdict be here? Thanks in advance R~

21 years, 4 months

Re: [linux-audio-user] New Asus Ath. XP 2500 Delta 1010LT performance

by Ben

... > From: Russell Hanaghan <hanaghan(a)starband.net> > Subject: [linux-audio-user] New Asus Ath. XP 2500 Delta 1010LT > performance ... > I'm using it as a live fx processor) But if I try to run at 96000 it > pops and stuff even at higher intervals (512, 1024,etc). > > I guess I expected it should be able to do this no problem and I > would > get better fidelity as a result. What would the possible verdict be > here? > > Thanks in advance > > R~ > > > I can't tell you what is causing this but you probably won't get a noticeable improvement by switching from 48 to 96 kHz. Your speaker system (and your ears) are probably incapable of resolving >20kHz signals in a live PA-type situation. Audio professionals ( mixers, mastering engineers, etc - not manufacturers ) are still undecided whether higher sampling rates is a good thing. If you are looking for higher fidelity sound, your time will be much better spent examining the gain stages of your system ( matching the impedances of inputs and outputs, etc ) rather than trying to get hicher frequency response though your DSP box. -Ben Loftis

21 years, 4 months

[linux-audio-user] Audacity now works with JACK

by Daniel James

Hello all, I've been trying out the newly improved JACK support in Audacity and can confirm that it does work. If other people could give this some testing I'm sure it would help solidify the feature. Please consider joining the audacity-devel list and sending feedback. To build Audacity with JACK support you need to do this: cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/audacity login (hit the enter key when it asks for a password) cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/audacity co audacity (the above is all one line) cd audacity ./configure --with-portaudio=v19 --without-portmixer (edit src/Makefile and add this to the end of the LIBS line if it's not there): -lasound -ljack Then make and make install as usual. Start JACK, start Audacity and you should have a JACK option in Preferences under Audio I/O. You may need to disable the VU meters to get reliable playback on a slow machine - that option is on each meter's drop-down menu. Cheers Daniel

21 years, 4 months

[linux-audio-user] normalize with sox

by luis jure

hello list, is there a way to normalize with sox in one pass? from the manual it seems that you must first find out the max value, and then pass 32768 (or whatever)/max to the vol effect... best, lj --

21 years, 4 months

[linux-audio-user] "Borealis" desktop sounds theme v.0.8 now available

by ico＠fuse.net

Hi all, Just wanted to let you know that the version 0.8 of the "Borealis" desktop sound theme is now available. For more info and for downloads please visit the usual place: http://www.kde-look.org/content/show.php?content=12584 Also, for those of you who like desktop eye-candy ;-), more stuff can be found here: http://www.kde-look.org/content/show.php?content=13876 (superkaramba desktop monitoring tool with minimal cpu footprint) http://www.kde-look.org/content/show.php?content=9049 (improved klaptop icons) Best wishes, Ico

21 years, 4 months

[linux-audio-user] Re: Note tuning and quantizer in audio files

by Greg Murphy

> I have a friend who runs a Pro Tools-based semi-pro studio in his > basement (and just about had to take out a second mortgage to pay for > > it!), and he showed me some plugins that handle note tuning. He > played > me an example with a singer unprocessed and then processed. It was > pretty neat, to say the least, but I have to say that the end result > sounded over-processed to my ears. It can make a mediocre singer > sound > good, that's for sure! I'm not sure I would use it for something > like a > guitar, though, where subtle nuances in fingering could be ruined by > trying to tune microtonic bends. > > -- Brett A bit of gentle adjustment with Antares Autotune is pretty transparent. Taking things to another level though try and have a play with Melodyne. It is the bees gonads Greg ___________________________________________________________ALL-NEW Yahoo! Messenger - sooooo many all-new ways to express yourself http://uk.messenger.yahoo.com

21 years, 4 months

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Linux-audio-user