Linux-audio-user January 2007

linux-audio-user@lists.linuxaudio.org

187 participants
180 discussions

[linux-audio-user] Sub-harmonic generator? (LADSPA or VST)

by Tim Howard

Hello, Does anyone know of a good plugin that will generate subharmonics? I would like to put a little more low frequency "oomph" into my bass track. Preferrable LADSPA, but VST would work, too. Thanks for any help! -TimH

8 years, 5 months

[linux-audio-user] Musix is being used at Joe Wilson Intermediate School in Cedar Hill, Texas, USA

by Marcos Guglielmetti

Article: http://www.musix.org.ar/wordpress/?p=53 Musix is being used at Joe Wilson Intermediate School in Cedar Hill, Texas, USA The school teacher Marilyn Hagle (marilyn.hagle [ … ] chisd.com) is using Musix in her lessons of music at Joe Wilson Intermediate School in Cedar Hill, Texas, USA. “I am a 5th/6th grade general music teacher and use bootable Musix CDs in our computer lab with students once a week. It rocks! First the students work on the easy rhythm practice exercises in Solfege. Then we go to the Hydrogen Drum Machine program and the students write their own rhythm patterns. I have each class for only twelve weeks a year. This twelve weeks term we are going to try compose a melody and add percussion to it. Note Edit would be the easiest to use with this age group, but in the .5 version it doesn’t load the synthesizer consistantly (could be user error of course :) ). I am downloading your latest release right now, so maybe that will have a fix.” We are working to debug this problem, maybe related to Timidity. “It might interest you to know that the students are now working on composing percussion accompaniments in Hydrogen for the program. We will be singing our school song, “The Lion Sleeps Tonight,” and playing a melody from Beethoven’s 9th Symphony on our recorders . . . all with Hydrogen accompaniments. :)” She have taught also in Minnesota and Chicago, her BA is in music and her MA in media communications, also she is certified to teach music and technology applications in Texas. Well, boys, another woman using GNU/Linux! But, “sadly”, she is married ;) Marilyn started using computers in the classroom in 1982, she moved to Free Software in 1998, and she thinks educators are crazy or lazy for not using GNU+Linux. Just a last note… Marilyn is exited about the new apps that were included into the last Musix’s version, 0.79 (we included them thinking about the needs of artistic schools and rock bands): “I was so excited to download your latest version and see it included Cinelerra and Blender!! Before I took this job, I taught high school computer animation using Blender (fabulous!). One of my educational goals has been to teach kids how to write their own songs and make them into music videos!!” Thanks Marilyn Hagle for using, teaching and spread Free Software! -- Marcos Guglielmetti * Director del desarrollo de Musix GNU+Linux, 100% Software Libre * CD Donwload: (http://www.musix.org.ar/en/) * Videos, programas y otras cosas en: ftp://musix.ourproject.org/pub/musix/ * Reporte de errores a: https://www.musix.org.ar/wiki/index.php?title=Problemas-Bugs *IRC: #musix channel on freenode * http://autosus.wordpress.com/

18 years

[linux-audio-user] Exporting Muse tracks to an audio file

by linuxmedia4＠netscape.net

Hi, When I need to record drum parts, I use Muse that triggers samples in Hydrogen or Specimen. Unfortunately, in this situation, Muse's 'Bounce to File' function doesn't allow me to export to an audio file (to use in ecasound) because this only works with Muse's built-in soft synths or soundfonts loaded into Muse (unless I overlooked something). Muse's 'simple drums' works pretty good and allows me to use the 'Bounce to File' function. But then I can't use multilayered drum samples. The solution would be to record in Hydrogen, and then export it to an audio file. But I just can't work with 'pattern based' sequencers because it's too limiting. I record all sequences with Muse because I can just press 'Record' and record for as long as I need to. Anyways... does anyone have any idea how to get Muse's 'drum tracks' to a stereo audio file so I can use it in ecasound? My Echo IO card doesn't have a 'capture function' like my SB Live card used to (so I can capture whatever comes through the card). I don't think 'timemachine' will work because I would have to find exactly were the 'beginning' starts in the resulting audio file. With the 'capture function' in the SB Live card, I would use ecasound to start recording everything coming through the card... but ecasound and Muse were synced (via jack) so it would start recording perfectly at the necessary point. With 'timemachine' you press 'Record', and then go to Muse and press 'Play' and meanwhile, you have a lot of dead space in the front of the resulting audio file. Any help would be appreciated... Thanks, Rocco

18 years

[linux-audio-user] FA-66, slackware, freebob, thinkpad R40 - cracks on recordings

by mea

Hello from Prague, I bought the firewire soundcard Edirol FA-66. Yesterday morning I compiled freebob, recompiled jack and within half an hour I already saw all 6 inputs and outputs in qjackctl. What? Recording on linux is hard? Pha! I thought but unfortunately my moment of victory didn't last long. On all recordings there is a strange cracking sound, not all the time, but every couple of seconds. No xruns though. Before I bought this device I used to record through the internal soundcard of my thinkpad R40, running all programs as root and this 'sort of' worked. So I thought I should first of all make sure all my apps can run as user. After a lot of reading (I spent all day on this yesterday before I decided to consult this list) I figured the best approach for me would be to use set_rlimits, because slackware doesn't have PAM, and I never patched a kernel before. As I understand these are the 3 possibilities for programs to run in realtime right? Well, in short I can now run qjackctl, jack and ardour as user without xruns, but this weird cracking is still on the recordings. To make sure it was not an ardour issue I tried sooperlooper, and the noise is still there. I suspect the trouble is probably freebob, because I didn't have this issue before and maybe I should have written on their list, but I am not completely sure and I found very useful information here before, so here I am, asking for any advice, because I don't know what to do anymore. Here is some more information about my setup> Thinkpad R40, Pentium4, 512MbRAM Slackware 10.2 uname -r 2.6.13 jackd version 0.102.20 tmpdir /tmp protocol 16 Ardour/GTK 0.99.3 (built using 1.4.1 with libardour 0.908.2 and GCC version 3.3.6) Gscanbus - Edirol SelfID Info ----------- Physical ID: 0 Link active: Yes Gap Count: 63 PHY Speed: S400 PHY Delay: <=144ns IRM Capable: Yes Power Class: +15W Port 0: Connected to parent node Port 1: Not connected Init. reset: Yes CSR ROM Info ------------ GUID: 0x0040AB0000C33B81 Node Capabilities: 0x000083C0 Vendor ID: 0x000040AB Unit Spec ID: 0x0000A02D Unit SW Version: 0x00010001 Model ID: 0x00010049 Nr. Textual Leafes: 2 Vendor: ROLAND DG CORPORATION Textual Leafes: EDIROL EDIROL FA-66 AV/C Subunits ------------- Unknown: 1 Unknown: 1 Thank you in advance, Best wishes Martin Alaçam

18 years

[linux-audio-user] Still on the look out for _GOOD_ sampled drums

by Julien Claassen

Hi all! I still have one problem: I don't have any acoustic drums I REALLY, TRULY love. I have one hardware synth with drums, which are ok in the mix )sometimes at least) and I have both the naturalstudio kits version 6 and version 7 as a soundfont. But they don't really satisfy me neither. They both sound a bit odd in the mix, they don't really fit in the room. The version6 is good and hard, but has a very short release on the snaredrums and I disagree with the bassdrum a bit and the version7 has good release, but sound a bit to soft. Even with some compression and other FX-processing I can't get them to sound really crunchy. So you see my being choosy and what I generally disagree with. I'm looking for a drumkit in eitehr sf2 or .gig format, which sounds very raw (no ambiance, no or very subtle FX-processing), not too soft in its attack, has good velocity layering and nice basic sampled instruments. If possible it would be nice if it had a few more cymbals (I like them :-)). Does anyone have experience with sampled drumkits, finding them, any good locations to start looking... Any kit on mind, which you think is very good for rock, jazz, a bit of metal or the like. Please give me a hint. For I found nothing except the hardware eDrums, which are very expensive, demand, that you can play real drums and demand a lot of real room to put them. All of that, I don't have. :-) Kindest regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

18 years

[linux-audio-user] Pd Book

by Peter Plessas

Dear list, The pd-graz community is proud to announce the release of the free download version of the "bang | Pure Data" book. Grab your copy at: http://pd-graz.mur.at/label/book01 regards, Peter Plessas (pd-graz)

18 years

[linux-audio-user] Anyone have any opinion on CMS?

by oktyabr

Hiya, I didn't want to post here until I actually had something to show off a bit but basically the story goes like this... I had some webspace I wasn't using so I registered www.linux-studio.org (nothing meaningful there at the moment) with the idea of setting up a... (save the rotten vegetables for a minute!)... ... forum. Specifically I want to put up a sort of blog on the front page with easy access to forums from there. Since combining a blog software with a forum can be tricky to get up as well as admin I thought I would look at an integrated solution in the form of one or another CMS (Content Management System) that can provide both in a small, efficient package. So if anyone out there has experience with CMS and can either recommend or recommend against any particular package that would be well suited for such a task I would be very happy to hear your opinions! There are a ton of them out there and it is quite time consuming to try them all and compare. I've been using the excellent resources at http://www.opensourcecms.com to try some of them out... it lets you try any one you like without installing it on your server first. I'm currently leaning a bit towards Geeklog and Jupiter CMS and an IT guy I asked recommended e107 but lots more testing to do before I know which is the right one for sure. Furthermore I know I'm not the only one on this list that has entertained the idea of a linux forum dealing with audio software. If any of you read this and might be interested in putting in a hand to try and build such a monster please feel free to email me directly if you like. Thanks for all the fish, Jon Hoskins

18 years

[linux-audio-user] Shaving CPU cycles

by Ken Restivo

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I've run into an 80% DSP problem on my machine. This poor little PC doesn't have enough CPU power to run all the softsynths and LADSPA plugins I tend to use. When JACK gets to 80% DSP usage, all hell breaks loose. If I up the latency, then my CPU usage goes down, but the system is unplayable (too much latency). So. What kinds of things would be best to try to squeeze some life out of this underpowered 1.66Ghz Core Duo? I have a list, but I'm not sure which would be the first, second, third order improvements and I'd like to try to conserve time, especially if the end result will end up being that I have to sell this PC and get a new one anyway. Do I have the priorities right? 1) Try jackdmp instead of jackd 2) Try DRM or some kind of accelerated graphics for Xorg 3) Blindly chase "latest and greatest" versions of things like kernel 2.4.20, latest jackd, svn freebob, etc. 4) Try messing around with PCI bus latency I'll try as many of those as you-all think might be worth pursuing, before moving on to hardware solutions: 5) Replace the CPU on this box with a 2.16Ghz Core Duo. 6) Get rid of the machine completely and get a new PC with 2Ghz+ Intel or AMD dual CPU, and PCI audio card not firewire. - -ken -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFFwG6We8HF+6xeOIcRApf6AKCmlNbp8oWhGP2THi+va2VqfKWGiACgqitk NWSBmNwyws/atURFGYO+FyE= =MouT -----END PGP SIGNATURE-----

18 years

Re: [linux-audio-user] Shaving CPU cycles

by Sampo Savolainen

Quoting Ken Restivo <ken(a)restivo.org>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I've run into an 80% DSP problem on my machine. > > This poor little PC doesn't have enough CPU power to run all the > softsynths and LADSPA plugins I tend to use. When JACK gets to 80% DSP > usage, all hell breaks loose. If I up the latency, then my CPU usage goes > down, but the system is unplayable (too much latency). > > So. What kinds of things would be best to try to squeeze some life out of > this underpowered 1.66Ghz Core Duo? I have a list, but I'm not sure which > would be the first, second, third order improvements and I'd like to try > to conserve time, especially if the end result will end up being that I > have to sell this PC and get a new one anyway. Do I have the priorities > right? There's a lot of things to do. "underpowered" is not a word I would use for a core duo processor. My list of things to do first would be: 1) SSE. Make sure all synths and ladpsa plugins are compiled with SSE support. (This is rarely done in distributions because SSE is not supported by all currently used x86 processors, we're getting quite close to that though) 2) Sharing. Instead of running separate reverb plugins on each track, create reverb buses for a small number of different types of reverbs. Usually there are two: one long reverb and a short one. Then use sends to send appropriate amount of the signal from each track to the effects bus. You can share other effects too, reverb is a natural choice for "sharing" as many mixes sound actually better with a coherent reverb space instead of having multiple varying reverbs. 3) Freezing. This means that in for example ardour, you can pre-render the effect of the plugins on a track. This can lower the DSP usage very much if you have tracks with heavy processing. > 1) Try jackdmp instead of jackd That might help. > 2) Try DRM or some kind of accelerated graphics for Xorg Accelerated graphics is a good idea. > 3) Blindly chase "latest and greatest" versions of things like kernel > 2.4.20, latest jackd, svn freebob, etc. I expect you don't mean 2.4. "Blindly chasing" is never a good idea, but there has been a lot of work towards better realtime performance in the latest kernels. I strongly urge you to try a newer kernel if you are running < 2.6.17, especially if it's without ingos' RT patches . > 4) Try messing around with PCI bus latency That might help a bit. But keep in mind that DSP usage of 80% is really high. It doesn't leave your computer much headroom for other tasks, or even plugins which might periodically use more CPU cycles than normally (=which is in fact a sign that a plugin is not "academically" real time safe). In my opinion 80% is about the maximum of DSP usage you can expect to be stable to work with. Remember that with the rest of the time, the CPU, operating system and the software need to do tasks like update GUI windows, run the disks, complete network traffic. Without time to complete these tasks, your computer will be unresponsive (altough it might still will be processing audio, though ;) ). Sampo

18 years

[linux-audio-user] jack transport slider

by Robin Gareus

Here's some glade-gtk application to implement a slider for jack transport: http://gjacktransport.sf.net/ to sum it up: * slider to control jack-transport * set slider start and end points in various units * memory: remember slider start/end points * auto-zoom and reposition slider * LASH support there are some open-loops: - missing/faulty drop-frame TC for videoframe units. - insane but intuitive zoom behaviour - no config-file, simple CLA parser,.. see TODO file none of which bugs me at the moment. It works fine on debian boxes. I'll wrap it up for a binary release and LAA. - feedback welcome. #robin

18 years

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Linux-audio-user January 2007