Linux-audio-user February 2013

linux-audio-user@lists.linuxaudio.org

142 participants
178 discussions

by Dave Phillips

Greetings, I have an old track that needs brightened up a bit. It was recorded on a mixing board cassette deck (I said it was old, didn't I ?), a direct feed I think, and the sound quality is, shall we say, unlovely. So how do I deal with such material ? Is an exciter useful in this scenario ? Or ... ? Anyone who wants to take a swing at it, here 'tis : http://linux-sound.org/audio/Whiter_Shade_Of_Pale.flac Recorded at a local festival, probably some time in the late 80s. Best, dp

12 years

OpenBSD release songs!

by John Murphy

Probably well known to most LAU subscribers, but some amazingly well crafted songs provided over the years with OpenBSD releases. Great artwork and lyrics too: http://www.openbsd.org/lyrics.html -- John.

12 years

Chiptune Accompaniment in Pure Data!

by Louis Gorenfeld

I finally got around to zipping up and releasing my chiptune accompaniment software that I debuted at San Mateo Maker Faire 2012. It's called Chip-o-Matic and it runs off Pure Data. I figured it'd be of interest to people on this list. Plus, it comes with a small document that talks about the history of chiptunes and how they work. Basically, you load it up in Pure Data, and then you can set the beat pattern/arpeg speed/tempo, choose the bass note with the lower octave, play arpeggios with the middle octaves, and play leads with the top octave. It can be gotten at http://extentofthejam.com/Chip-o-Matic-1.0.tar.gz And here's a small thrown-together sample of me noodling with it: http://www.extentofthejam.com/ChipQuickie.mp3 Happy Valentine's Day, everyone! Louis

12 years

Cheap ribbon mics

by Bob van der Poel

Anyone used one of cheap ribbon mics I see on feabay for well under $100? Yeah, probably get what you pay for ... but I don't have 2 to 4 grand just to play with one. I'm doing some in-home recording of a tenor sax and I've heard that ribbons are really good for this. Comments appreciated. -- **** Listen to my CD at http://www.mellowood.ca/music/cedars **** Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

12 years

Audio distros

by Ralf Mardorf

Not this again ;)! My apologies, but I'm searching for a distro comparable to old Arch Linux or old Ubuntu Studio. For another thread Gene was talking about "black magic" and indeed some "things" are "occult" in the sense of "hidden" ;). FWIW, all ADAT channels of my RME card, that aren't working for Linux, are working for my FreeBSD. The Xfce menu icon of FreeBSD only, is replaced by a pentagram, for me it's just some kind of asterisk, without any super cow powers, but perhaps this does the magic. The next Xfce install will get the same icon ;D. I dropped my old Arch, regarding to too many issues with the unfinished switch to systemd. Following the mailing list I had the impression, that the transition is complete and that there are no serious issues any more, but trying to install it yesterday, I suspect that mails regarding to issues simply are rejected. I still try to install the current Arch Linux later today, but seemingly the transition to systemd isn't finished yet and perhaps the next wicked transition already will be enforced in a hidden way. Just an assumption, I don't claim that it is that way. While my request regarding to pppoe for the install doesn't pass list moderation, eth0 isn't up and doing it as usual doesn't work, I read rude words about request to keep Wayland optional. It seems to be, that some people using X anyway need to install Wayland. Fortunately there's a German Arch Linux forum, where it's still possible to get help, but I also need clarification in what direction Arch Linux will go in the near future and I prefer a distro with a sane mailing list. Debian and Ubuntu still have good mailing lists, but as for Ubuntu Studio I have several generations installed, from 10.10 Maverick to 12.10 Quantal. The performance on my machine dramatically slows down with each release. Quantal for some tasks already is unusable, a lot of the non-audio desktop apps I need are buggy and this isn't an issue for my machine, but the troubles are common, for many users. Last time I monitored the poll the most used distros were Arch Linux and Ubuntu Studio. Yes, that are my distros too, ok for 2012 and perhaps ok for 2013. But how will those distros continue? Regards, Ralf

12 years

Running the guitarix LADSPA plugins on a headless system

by Jeremy Jongepier

I'm trying to figure out what is the best way to use the Guitarix-Amp and Guitarix-FX LADSPA plugins on a headless system (read Raspberry Pi). I've tried it with Ecasound but it already consumes more CPU than the guitarix application itself! So I'm obviously doing something wrong. Maybe this is because the Guitarix-Amp plugin has one input and two outputs, read something about Ecasound starting up multiple instances of the plugin in such a case which is not what I want. So any hints or tips on getting this to run smoothly? I can use either JACK or ALSA directly. I prefer using JACK, somehow using bare ALSA produces large amounts of xruns. Thanks in advance, Jeremy

12 years

pyOSC problem

by Christoph Kuhr

Hi everyone, yesterday i tried to include pyOSC in a python3 project. I register my callbacks, the address space is correct. I connect to the server, it works. But nothing happens if I send messages from puredata to any address. Even not the default handlers. Wireshark captures the packets. do you have any idea, what might be the problem, where I have to look? thanks and regards, Ck

12 years, 1 month

Building Audio from a Server Core?

by grekimj＠acousticrefuge.com

On Wed 27/02/13 5:33 PM , "Len Ovens" len(a)ovenwerks.net sent: > > On Wed, February 27, 2013 10:46 am, Grekim Jennings wrote: > > How difficult or even possible is it to start > with a server core system> and make it useable for a audio? I don't need a > GUI/desktop for this. > Not sure what you mean by a "server core". It could be starting > with coreserver SW installed. Or be specific HW. Adding Audio Apps to a machine > setup as a server is not hard, though a new install would be easier. The > onlyreason to keep the server SW in place is if you want to use the machine > both ways. In that case I would suggest setting up another run level > justfor audio. That would make it easy to turn off some of the system > serviceswhile doing audio or reconfigure some of the core defaults. On the > otherhand, if you want the machine to run as a server while also using it to > doaudio work, one of your two uses will suffer. Either the server side > willbe slower or the audio side will need more latency. > This would be for the sole purpose of audio, and GUI-less ones at that. I also like the idea of being able to carry a studio on a flash drive...sort of amazing. Another machine would have Ardour etc. I came across the "server core" terminology from the Lubuntu alternate downloads area. So, my impression was a server system is a bit more raw and basic than a desktop system and going with a "core" version of that would be almost as basic as it gets. I know there are distros tuned for audio, but I honestly don't like all the extra stuff I don't need. > > I installed Lubuntu server core to a usb flash > drive. I added myself to > Ok, this looks like just adding audio SW. Take a look at the > ubuntustudiometas with whatever SW installer you use. (synaptic would be easiest I > tihnk) You most likey do not want the -desktop, icons or settings, just > the audio related ones. Though it may be just as easy to choose the > appsyou want. > > > the audio group, but my usb Audiobox does not > seem to be working,> although it is recognised with aplay -l. Should > it work without any> additional steps? > > Working? Meaning what? Does lubuntu use pulse like most of the other > *buntus? Have you set your USB card as the default sound device with > pavucontrol? Which application are you playing audio on? If the machine > you are using has an internal card, that would be the default, not your > USB card. Are the levels raised in the alsa mixer? Not muted? > I noticed when running my software that the playback variables are set correctly through Alsa calls, but the record ones are not. It's just the first time the (Presonus) Audiobox has not initialized properly on probably a dozen systems I have tried it on. I'm assuming the kernel should be the same between a server and a desktop. I works fine on the same 12.04 desktop/Unity version. I wasn't sure if we needed to run modules or set something a certain way to tap audio capability in a server system. Again, doesn't have to be a sever system at all. I just thought it might be closer to what I am after to begin with. > So what are you trying to achieve? And how? It would be easy to tell > thesethings if I was there in person, but I am not and so to help you we > needas many details as possible. > Thanks for the help :) See above about the goal here. But again, I crave simplicity and I like to build a system around a specific task and not have one machine do everything. > > I suppose I could build an Arch system, but I > was pleasantly surprised> by the performance of Ubuntu 12.04 (desktop) > with the particular> software I want to run and thought I would try > an even more basic> setup. Thanks! > > Pretty much all the Linux setups use alsa these days. There is not much > difference from one to the next at that level. You should be able to > getsound with any of them. > > > -- > Len Ovens > www.OvenWerks.net > > >

12 years, 1 month

Jack users - how many channels do you want with PA module-jackdbus-detect?

by Kaj Ailomaa

I'd like to put out a question. What would seem like the most common channel configuration when using the module-jackdbus-detect? module-jackdbus-detect is a module that will detect when jackdbus starts, and automatically creates a Pulseaudio sink and source for jack. It's a part of the pulseaudio source, and is separated into its own package on Debian based distros, called pulseaudio-module-jack. Currently, it will create as many channels for its sink and source, separately, as there are channels on your audio device. Also, it follows the standard model for surround audio, so if you have 8 channels, the module will create a 7.1 interface for the sink and source. In the case where you have 8 in and 2 out, the module will create 7.1 sink and stereo source. In the case where you have more than 8 channels, it will create 7.1 and add connections named "aux" for each additional channel. There's now a patch in PA 3.0, written by Peter Nelson, that allows us to configure how many channels PA should have for both in and out at once. I'm proposing to have the module be stereo by default. Would this be what people want?

12 years, 1 month

Building Audio from a Server Core?

by Grekim Jennings

How difficult or even possible is it to start with a server core system and make it useable for a audio? I don't need a GUI/desktop for this. I installed Lubuntu server core to a usb flash drive. I added myself to the audio group, but my usb Audiobox does not seem to be working, although it is recognised with aplay -l. Should it work without any additional steps? I suppose I could build an Arch system, but I was pleasantly surprised by the performance of Ubuntu 12.04 (desktop) with the particular software I want to run and thought I would try an even more basic setup. Thanks!

12 years, 1 month

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Linux-audio-user February 2013