Linux-audio-user May 2003

linux-audio-user@lists.linuxaudio.org

101 participants
106 discussions

[linux-audio-user] [announce] seq24 0.4.2 released.

by rob buse

hello all! I usually wouldn't post the release of a minor version, but I updated the main view and it looks a lot better than it did. I figured some of you would want to see it / use it: http://www.filter24.org/seq24/ cheers, rob buse

21 years, 7 months

[linux-audio-user] The sound dropout problem

by toby＠tobiah.org

Recently, after having tried every fix I could find on the net for fixing the dropped samples that I get out of my Delta44, it hit me to simply try 'nice'. I got a profound increase in sound reliability by preceding my play command with 'nice -n-20'. I was finally able to get a couple of dropouts this way, by simultaneously executing a recursive long directory listing from the root (in other words thrashing the hard drive), but I found that using nice, I am at least to the point now that I can operate under normal conditions with reasonable assurance that I am not going to ruin a recording with drop outs. This raises some questions. If negative 'nice' greatly relieves my sound stablility problems, then what does this say about the origin of the problem. Does it determine which of the many causes (irq order, pci latency, kernel preemption, disk throughput, etc..) should be focused on to further alleviate the trouble? Also, are there any suggestions as to how to conveniently make sure that all processes that use the sound driver run at the higher priority? If 'nice' is to be used, what is the best way... Shall I run them as root using nice, or is there another way to automatically cause them to be -nice, perhaps even when run by normal users? Thanks, Tobiah

21 years, 7 months

Re: [Jackit-devel] Re: [linux-audio-user] low latency

by Jack O'Quin

Paul Davis <paul(a)linuxaudiosystems.com> writes: > >Then use --with-default-tmpdir=/mnt/ramfs to the JACK configure > >line when you build it. No clients need to be recompiled. > > true, but no clients will be able to find the server. No. That parameter is passed at *build* time. So, the new directory gets built into both libjack and jackd. > this is where the idea of a conf file starts to make sense. all > clients (and jackd) would look at it to find out where to talk to each > other. That would be much cleaner. -- Jack O'Quin Austin, Texas, USA

21 years, 7 months

[linux-audio-user] low latency

by Patrick Shirkey

For those of you who don't follow the jack list there was a recent (semi) discovery htat greatly improves performance for journalled filesystems. The main problem is that jack writes data to a /tmp file. It has been found that mounting /tmp as tmpfs (in RAM) solves the problems that many people have experienced with lockups while using JACK. Just put this in your /etc/fstab none /tmp tmpfs defaults 0 0 I have added this info to the low latency howto also. -- Patrick Shirkey - Boost Hardware Ltd. Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== Being on stage with the band in front of crowds shouting, "Get off! No! We want normal music!", I think that was more like acting than anything I've ever done. Goldie, 8 Nov, 2002 The Scotsman

21 years, 7 months

[linux-audio-user] (semi)professional "field" recording work, what to use?

by Wilbert Berendsen

Hi, this is my first posting to this list; I'm a professional musician (organist) and avid Linux user from the Netherlands. I want to make good quality recordings with lightweight equipment and to further process the recordings on my Linux desktop PC. Currently I own a DCC recorder, but there are no DCC tapes available anymore. I have some tapes, but they are starting to show problems. So I'm in the market for some new equipment. I researched quite a lot and I think there are the following possiblities: 1. Minidisc recording. consumer minidisc recorders are very compact which is good. But they almost never have a digital out. Some have USB, but will not function as an USB-Audio device under Linux (AFAIK, all use the proprietairy NetMD protocol, which is partially reverse engineered, see: http://www.marcus-brinkmann.de/freemd.en.html). so to use most consumer market MD recorders it looks like I have to have a good audio interface to record the sound from MD to my PC (and still have it D->A and A->D converted in the process.) A professional MD recorder which looks very good (the HHB PORTADISC MDP500, see: http://www.hhb.co.uk/000/int.htm) has an USB interface that if I understand correctly just manifests itself as an usb audio device under Windows, and should thus also work with ALSA (?) so with that recorder I could once record the sound and futher process it fully digitally. The price is around EUR 1600,= which is quite a lot. My main concern would be the availability of MD's. 2. Harddisk/flashcard/cd-rw recorders. It seems these are very expensive now. 3. A laptop with a good (external?) audio interface (M-audio USB?) Just Linux on it and arecord -f cd full_concert.wav :-) My question is: What equipment do other people use? Would the HHB MDP500 be a good choice? Will MD stay for another decade? I think it is important that open standards are used (I feel more confident with usb audio than e.g. NetMD) thanks in advance for sharing your thoughts :) regards, Wilbert Berendsen -- Wilbert Berendsen (http://www.xs4all.nl/~wbsoft/) "You must be the change you wish to see in the world." -- Mahatma Gandi

21 years, 7 months

[linux-audio-user] Re: [Jackit-devel] Ahh

by Steve Harris

On Thu, May 15, 2003 at 09:14:36 +0200, Robert Jonsson wrote: > Hi Nick, > > > I can't imagine what else would cause problems with LADSPA plguins in > > general on my system. It has to be Yet Another Operator Error somewhere. > > If these plugins were this bad everyone would be complaining, > > I'm sorry I missed the beginning of this thread, are there any specific > plugins that are acting up? > > I think Steve will agree with me if I claim that some of the plugs _are_ > buggy. But with so few bugreports it's difficult to fix. (unless there's some > LADSPA/swh list I've missed?) Hey, that's the truth ;) I have got some valuable bug reports from Nick, but I've yet to fix the problems, thier deep and tedious to fix sadly. I have been doing a fair bit of plugin hacking recently, I'l make a new relaese when I've fixed the problem Nick found (flanger IIRC). Theres done seem to be some SSE2/gcc3 wierdness going on too, I saw a mention of some related sounding problems in an article somewhere, but I forgot what the problem they'd found was. I have been considering a mailing list so I can get consensus on bug reports, if there are enough interested people I'l set one up. Another idea (suggested by Dave Phillips) is setitng up a web page where people can make comments agianst the docs or something, but that involves me writing the web stuff, Its a great idea but frankly I'd rather put my efforts into writing plugins. I will get round to it if there aren't enough people for a list though. - Steve

21 years, 7 months

[linux-audio-user] Re: tkeca recording more than four channels?

by Daniel James

> I don't know how the multichannel cards works. I think that using > OSS emulation you could make something like that: > stereo channel 1 ---> input device: /dev/dsp > stereo channel 2 ---> input device: /dev/dsp1 > stereo channel 3 ---> input device: /dev/dsp2 > stereo channel 4 ---> input device: /dev/dsp3 With Audacity (which also uses OSS emulation) you just choose /dev/dsp and the number of recording channels you want, up to 16. Unfortunately Audacity 1.1.3 doesn't seem to scale well beyond four input channels on our machine. Does tkeca have native ALSA support, or does it use OSS emulation only? Thanks Daniel

21 years, 7 months

[linux-audio-user] Jack Audio Connection Kit version 0.71.2

by Taybin

Updated README with tip for better performance. Removed fltk example client from package. This should fix any problems with building the fltk client. Taybin Rutkin

21 years, 7 months

[linux-audio-user] noteedit-2.1.2(ritardando, pedal marks)

by Joerg Anders

Version 2.1.2 of the cost free musical score editor NoteEdit is available: http://rnvs.informatik.tu-chemnitz.de/~jan/noteedit/noteedit.html New features: - ritardando - accelerando o to create a audible ritardando (accelerando) simply place the ritardando (accelerando) between two different tempo signatures. NoteEdit assumes the ritardando (accelerando) begins at left tempo signature and ends at right tempo signature - piano pedal marks o TiMidity++ users! NoteEdit uses the MIDI PEDAL COMMANDS to play the pedal on/off signs. Unfortunately, TiMidity++ treats these commands wrong. Therefore, if you are a TiMidity++ user, it is recommended to avoid the MIDI PEDAL COMMANDS during replay (see "configuration section"). Unfortunately, the pedal on/off signs have no effect in this case :-( -- J.Anders, Chemnitz, GERMANY (ja(a)informatik.tu-chemnitz.de)

21 years, 7 months

RE: [linux-audio-user] [OT] ? DVD questions: summary

by Matthew Sargent

> I downloaded and built the very latest Xine, and I must > say, it rocks. > Alas, it's crashing my X server or my window manager (or both). After > using Xine my X session segfaults if I switch workspaces in Blackbox. > Does anyone else know about that problem ? How are you closing it? May sound an odd question but IIRC there's something in the (lengthy and pretty good) documentation for the version I installed some while back that suggests you'll run into memory problems unless it's closed with Ctrl+Q. Sorry if this is a little vague, but it may provide a pointer.

21 years, 7 months

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Linux-audio-user May 2003