Linux-audio-user August 2008

linux-audio-user@lists.linuxaudio.org

130 participants
106 discussions

by Shawn Wallis

I have a DELL XPS M1530, its new, it cost like $2700. You said dell is a professional vendor... does it sell extra power adapters? > Message: 17 > Date: Thu, 14 Aug 2008 14:46:31 +0200 > From: "Martin Horn" <martin.horn(a)ostec.org> > Subject: Re: [LAU] My Tascam US-122 > To: "Jamie McLaughlin" <j.mclaughlin(a)sheffield.ac.uk> > Cc: linux-audio-user(a)lists.linuxaudio.org > Message-ID: > <a41657e10808140546i5592d58nac1ef0d6f7789d32(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > On Thu, Aug 14, 2008 at 12:08 PM, Jamie McLaughlin < > j.mclaughlin(a)sheffield.ac.uk> wrote: > > > Hi, > > > > I have been advised not to disconnect the earth pin from a laptop in > > these circumstances. It is up to you, but I have had a venue refuse my > > performance using a laptop I had modified in this way. > > > > Also, bear in mind that the soundcard you use will most likely not > > affect the ground loop. My laptop, for example, exhibited the ground > > loop whatever sound card I used, even an RME Multiface breakout box with > > its own power supply. > > > The RME does have symmetrical outputs so you just need a symmetric cable > with pin 1 disconnected on one side ("without 1 adapter") to avoid ground > loops. > > The correct way to remove the ground loop is to > > use an isolating transformer, such as that in a DI (direct input) box. > > > Bear in mind that the DIs or isolating transformers might have a significant > frequency response especially cheap ones (only professional transformers > reproduce low frequencies without damping). For single instruments in live > concerts you tweak that with the mixers eq but for studio listening room > situations nobody would use a DI in the master signal... (if not Klark > Teknik or BSS which cost like 120 Euros each, you can almost buy a new > laptop for this ; ) ) > > > > Most venues will have DI boxes, or you can buy your own. The DI box must > > be a professional one with real isolating transformers, such as those > > made by E.M.O. I bought a passive stereo EMO DI box (E525). > > > > http://www.canford.co.uk/Products/20-032.aspx > > > > Of course, the very best thing to do is eventually upgrade to a laptop > > which does not exhibit a ground loop. > > > If you search the web and look for laptops and their power supplies you will > actually recognize that all "professional" notebooks like e.g. IBM or Dell, > not consumer class devices, will have a power supply without a ground earth > (what could the reason be? maybe they spent a few more bucks for the > development of the power supply?). > > I now have a Thinkpad X41, which > > does not have the problem. > > > > Good luck! Ground loops are annoying. > > > > Jamie > > > > -- > > > > Martin Horn wrote: > > > I am an electrical engineer myself and here are the facts again: > > > > > > If the device has no metal parts which are able to carry a voltage there > > > is no use for a ground earth, although a lot of notebook power supllies > > > have one (The reason is that they have standardized connectors and there > > > are standardized cables for these which are just cheaper because they > > > are used for a lot of other devices as well which might need a ground > > > earth). > > > > > > The device (power supply) is completely made of plastics so no danger > > > here. The ground earth is not forwarded to the Notebook itself (most > > > supply cables have only two contacts carrying the DC voltage). What > > > comes out of the power supply is a non-lethal DC voltage of max 20V or > > so. > > > > > > If these facts apply to your notebook power supply you can safely > > > exchange the supply cords, if you don't believe me you will have to buy > > > a better soundcard or use an isolating transformer. > > > > > > Greetz > > > > > > > > > On Wed, Aug 13, 2008 at 9:03 PM, Arnold Krille <arnold(a)arnoldarts.de > > > <mailto:arnold@arnoldarts.de>> wrote: > > > > > > Am Mittwoch, 13. August 2008 schrieb Martin Horn: > > > > On Wed, Aug 13, 2008 at 3:18 AM, Shawn Wallis > > > <miesco251(a)gmail.com <mailto:miesco251@gmail.com>> wrote: > > > > > When I unplug my AC for my laptop, the noise stops... WHen add > > > > > brightness to my laptop screen I get less noise... > > > > I suppose your laptop has an earth connection on the power cord. > > > Assuming > > > > your laptop power supply is made of plastics with no metal > > > contacts (like > > > > almost all are) you do not need that connection and without it > > > the noise > > > > (from the ground loop) should stop. Just put some kind of > > > isolating tape > > > > over the metal contacts from the earth ground (maybe two layers, > > > because it > > > > might get cut when plugging in) and your ready to go. If you > > > don't want to > > > > carry that tape with you all the time you should try to exchange > > > your power > > > > cord (those from electric shavers looking like an "8" work > > > sometimes). > > > > > > And here came the advice of the stuff you shouldn't do. > > > Yes, it might fix your problem. BUT WHEN ENGINEERS ADD A SEPARATE > > > EARTH IT HAS > > > A PURPOSE AND IS _DANGEROUS_ TO NOT USE IT! > > > Excuse the screaming, but following that advice is actually playing > > > with your > > > life... only do that if you have a death wish. > > > > > > Arnold > > > -- > > > visit http://www.arnoldarts.de/ > > > --- > > > Hi, I am a .signature virus. Please copy me into your ~/.signature > > > and send me > > > to all your contacts. > > > After a month or so log in as root and do a "rm -rf /". Or ask your > > > administrator to do so... > > > > > > _______________________________________________ > > > Linux-audio-user mailing list > > > Linux-audio-user(a)lists.linuxaudio.org > > > <mailto:Linux-audio-user@lists.linuxaudio.org> > > > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > _______________________________________________ > > > Linux-audio-user mailing list > > > Linux-audio-user(a)lists.linuxaudio.org > > > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > _______________________________________________ > > Linux-audio-user mailing list > > Linux-audio-user(a)lists.linuxaudio.org > > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > >

17 years, 2 months

Looking for Resource Help with using Midi in a Church and School

by mowestusa

I'm looking for guidance. I serve at a church and school, and we would like to begin using midi but no one here knows a lot about it. Personally, I use Linux as my main work desktop and home desktop, and have done some Linux audio recording and editing under Linux, but nothing with midi. Before the church invests tons of money in a new keyboard or midi software that only runs under Windows. I was wondering if: 1. What are some good resources on the web to understand what midi can do for us and what it can't do? (Basically, where can I learn about midi as a technology.) 2. We would like to use midi for (School Music, accompaniment for the children to learn new music. Choir Music, accompaniment for the choir director so she does not have to play the piece and direct at the same time, might be nice here to be able to play just the bass line then all four parts at once. Church Music, accompaniment for congregation for services when we don't have a live organist or when we have a small group worship setting. Church Music, to add variety of instrument sounds that we can't get from an organ or a piano.) 3. Finally, can midi under Linux handle the above tasks. What would be a wise investment in equipment to get started with the goals above? I don't want to spend $2000 on a new keyboard when instead something like the Yamaha QY100 would be a better investment. I have asked others if I can have their midi files and many have said that they are in Qbase so I imagine a Windows Program format will not work with Linux software. We do have a keyboard with Midi in and we do have a Pentium 1Ghz with 512megs of ram, would that be enough to get us started if we buy an midi interface, and I have no idea which one? Even if you just point me to some reading materials, it would be appreciated, because we are in the dark right now. Thanks, ---------------------------- | Steve | | mowestusa(a)yahoo.com | | mowestusa.nixsyspaus.org | ----------------------------

17 years, 2 months

jack_capture not working since 0.9.17

by Peder Hedlund

There's something fishy going on in .18 and onwards. In .17 I can do jack_capture -c 2 -p system:capture_9 -p system:capture_10 to record the spdif on my Audiophile 2496. In >= .18 I get a segfault, the only thing I can run is jack_capture -c 2 -p "system:capture*" to record the 1 and 2 ins. I'm running jack-0.112.0-svn2557 non-realtime with 2048 fr/per on OpenSUSE 11. strace-logs here: http://www.musikhuset.org/~peder/JC17.txt and http://www.musikhuset.org/~peder/JC18.txt And a trivial note: once you've started the GUI there seems to be no way of ending it apart from Ctrl-C or killing the process. - Peder

17 years, 2 months

My Tascam US-122

by Shawn Wallis

I got m Tascam US-122 it works fine, the mixers for it dont work in Qamix and gnomealsamixer, when I choose the usx2y soundcard the mixers are blank, nothing there. IS that suppost to happen? ANyways, I am getting noise from my KRK Rokit powered 5 speakers, headphones in the tascam gives me no noise, then I plug from the headphones output of the tascam to the speakers and I get noise! So I think it might have something to do with the speakers? The noise starts when I plug the USB for the tascam in, even when its not plugged in and just touches the metal it makes the noise. When I unplug my AC for my laptop, the noise stops... WHen add brightness to my laptop screen I get less noise... Does anyone have any solutions, more troubleshooting tips? Thanks.

17 years, 2 months

Crapberry users

by Florian Faber

Please, can anyone remove geechy(a)suncom.blackberry.net from this list? I get an error message for every mail I post on this ML. I already contacted the administrator, but nothing happens. Flo -- Machines can do the work, so people have time to think. public key 6C002249 x-hkp://wwwkeys.eu.pgp.net

17 years, 2 months

Multi-port MIDI interface for PC ?

by Andre Majorel

As recent PCs have no joystick port, my DA-15 adapters are not much good any more. Guess it's purchase time again. While I'm at it, I'd like more ports. I gather that these days, instead of standalone MIDI matrixes, you have multi-port boxes that have built-in MIDI matrix functionality and a USB port so they can double as a MIDI interface for a PC. Is that right ? The Edirol UM-880 looked good and was supported by ALSA, but it's not made any more and used ones don't seem to be so common. What's still in the stores is : - MOTU MIDI Timepiece (around 600 EUR) - MOTU Express XT (around 400 EUR) - MOTU MIDI Express 128 (around 200 EUR) For the price, I'm guessing the Express 128 does just I/O, not matrix functions. What else is there to know ? I've heard complaints about the latency of the MOTU interfaces. How is it under Linux ? Is the MIDI Timepiece worth the extra money over the Express XT if all you're doing is talking to synths and maybe a Syncman MTC<->SMPTE ? Are there any other 8-I/O port interfaces still being made ? Or good ones that are out of production but available on the used market ? Thanks for helping me catch up with the last fifteen years. -- André Majorel <URL:http://www.teaser.fr/~amajorel/> Do not use this account for regular correspondence. See the URL above for contact information.

17 years, 2 months

Re: [LAU] [LAD] [ANN] CLAM 1.3, 'Shooting flying plugins' release

by Hector Centeno

On Wed, Aug 13, 2008 at 8:45 AM, David García Garzón <dgarcia(a)iua.upf.edu> wrote: Thanks! Gracias! This looks amazing! Specially the binary generation of LADSPA plugins. I tried to install adding the Ubuntu Hardy repository to synaptic ( deb http://clam.iua.upf.edu/download/linux-ubuntu-hardy ./ ) but got this errors when trying to install: clam-networkeditor: Depends: clam-networkeditor-examples but it is not going to be installed Depends: libqt4-designer (>=4.4.0) but it is not installable Depends: libqt4-opengl (>=4.4.0) but it is not installable Depends: libqt4-svg (>=4.4.0) but it is not installable Depends: libqt4-xml (>=4.4.0) but it is not installable Depends: libqtcore4 (>=4.4.0) but it is not installable Depends: libqtgui4 (>=4.4.0) but it is not installable Trying to install libqt4-designer using apt-get gives this: Package libqt4-designer is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However, the following packages replace it: qt4-designer libqt4-gui E: Package libqt4-designer has no installation candidate Cheers, Hector > The CLAM team enraptured to announce the 1.3.0 release of CLAM [1], the C++ > framework for audio and music, code name ''The Shooting of the Flying Plugins > release''. > > Highlights of this release are: > - Automatic binary generation of LADSPA plugins containing the network you are > editing in NetworkEditor. > - Also a new simple API to code CLAM based Ladspa by hand. See [2] > - More FAUST integration into network editor: edit faust code, compile, > reload, view the svg diagrams (Natanael Olaiz GSoC) > - Lots of usability enhancements on the NetworkEditor: cut&paste, context > menus to connect ports, keyboard shortcuts, default double click actions, and > a processing tree filter (Natanael Olaiz GSoC) > - Annotator has also enhanced its functionality (Wang Jun GSoC): > - You can build a project that aggregates content from several extractors > - Extractors may have a config file > - Extractors can write back data (useful if the extractor is a database of > webservice and needs to upload modifications) > - New ProgressControl widget and paired AudioFileMemoryLoader processing to > support seeking (Pawel Bartkiewicz GSoC) > - A bunch of new 3D spatialization processings from CI Barcelona Media[3] > audio research group. > - Scripts [4] and graphical front-end [5] to generate a native CLAM plugin > project from scratch. > - Experimental Python bindings [6] > - TickExtractor example is compiling again (many thanks to Amaury Hazan from > MTG-UPF) > - Development deployment for Windows native compilation using MinGW (Wang Jun > GSoC) > > And a lot of small nice features and fixes you will appreciate for sure. > Source and binary packages for different platforms are available at the CLAM > download page [7]. See also: development screenshots [8], the CHANGELOG [9], > and the version migration guide [10]. > > We are also very excited on what next releases promise us. Some ongoing work: > - Generating other types of network based plugins and programs (LV2, JACK, > VST...), > - Subnetworks (Natanael Olaiz GSoC) > - Improved OSC support, 3D scene descriptors parametrization receivers > processings and Blender exporter to the spatialization processing > choreographer. (Natanael Olaiz GSoC) [11] > - Typed controls (Francisco Tufro GSoC) > - A new musician-oriented standalone chord extraction application (Pawel > Bartkiewicz GSoC) > > > [1] http://clam.iua.upf.edu > [2] http://iua-share.upf.edu/wikis/clam/index.php/Building_a_LADSPA_plugin > [3] http://www.barcelonamedia.org/ > [4] > http://audiores.uint8.com.ar/blog/2008/07/07/clam-processing-generator-scri… > [5] > http://clam.iua.upf.edu/wikis/clam/index.php/Image:ProcessingCodeGenerator.… > [6] http://audiores.uint8.com.ar/blog/2008/08/03/interactive-clam-programming/ > [7] http://clam.iua.upf.edu/download.html > [8] http://clam.iua.upf.edu/wikis/clam/index.php/Development_screenshots > [9] http://iua-share.upf.edu/svn/clam/trunk/CLAM/CHANGES > [10] http://iua-share.upf.edu/wikis/clam/index.php/Version_Migration_Guide > [11] http://dadaisonline.blogspot.com/search/label/blender related blogging > > -- > David García Garzón > (Work) dgarcia at iua dot upf anotherdot es > http://www.iua.upf.edu/~dgarcia > > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev(a)lists.linuxaudio.org > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev > >

17 years, 2 months

Re: [LAU] zoom h2

by Milos Mandaric

Works out of the box on Ubutnu(Hardy)with Audacity. Just select "H2: Usb Audio" at preferences of Recording audio in Audacity.

17 years, 2 months

Open Source Musician Podcast Episode #2

by Daniel Worth

After a long break to help me figure things out I finally have a new episode up. I have a new co-host. Check it out I hope you like it. http://opensourcemusician.libsyn.com/

17 years, 2 months

[ANN] klick 0.8.0, gtklick 0.1.0

by Dominic Sacré

Hi all, klick 0.8.0 is out, as well as the first release of its GUI frontend, gtklick. klick ===== klick is an advanced command-line based metronome for JACK. Features include tempo maps, four built-in sounds to choose from, JACK transport support, and a lot more. Changes in version 0.8.0: * There's a new "interactive mode" that allows you to change tempo, meter and volume while klick is running. This one was long overdue. * klick now speaks OSC. Currently only the most basic features can be controlled via OSC, but more will be implemented in the future. http://das.nasophon.de/klick/ gtklick ======= gtklick is a GTK metronome that uses klick as its backend. It's written in Python, and communicates with klick through OSC. gtklick is intentionally much more simple than klick, and does not support any of its more advanced features. http://das.nasophon.de/gtklick/ Cheers, Dominic

17 years, 2 months

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Linux-audio-user August 2008