Linux-audio-user May 2013

linux-audio-user@lists.linuxaudio.org

112 participants
125 discussions

Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency audio

by Carlos sanchiavedraz

2013/5/5 Carlos sanchiavedraz <csanchezgs(a)gmail.com>: > 2013/5/3 Carlos sanchiavedraz <csanchezgs(a)gmail.com>: >> Hello all, >> >> >> 2013/4/23 Carlos sanchiavedraz <csanchezgs(a)gmail.com>: >>> 2013/4/22 Nicola <nicola.di.marzo(a)vodafone.it>: >>>> Il 22/04/2013 09:46, Carlos sanchiavedraz ha scritto: >>>> >>>>> 2013/4/19 Nicola <nicola.di.marzo(a)vodafone.it>: >>>>>> >>>>>> Il 19/04/2013 19:54, Jeremy Jongepier ha scritto: >>>>>> >>>>>>> On 04/19/2013 11:11 AM, Nicola wrote: >>>>>>>> >>>>>>>> That's great, "keep it simple" i should say...that's why i think it's >>>>>>>> brilliant! >>>>>>> >>>>>>> >>>>>>> Keep an eye on http://ampbrownie.com/ then, it's an effort to make it >>>>>>> even >>>>>>> simpler. >>>>>> >> [...] (On last few days I sent two more responses but... only to Nicola instead to the list, so here they are. Things that happen. And I add one more step) >> >> I gave it another shot. >> This time around I started with a stock Wheezy Raspbian >> (2012-12-16-wheezy-raspbian) and executed inside the Ambrownie config >> script. >> >> Step 1, raspi-config, went well except for an error when trying to >> expand the memory. Well, I think it is because it is fixed to expand >> an sd card at /dev/mmcblk0 and I'm using an usb stick at sda. This is >> no problem for the moment. >> >> Step 2, updating and installing specific packages from autostatic and >> others, went well or it seemed so. I connect through "ssh -X" and >> executed Qjackctl to make first config, but every time I tried to >> start Jack it throws an error that it cannot start. Tried different >> configs but no luck. >> I didn't connect any soundcard yet. >> >> I would like to know if anybody tried this script with success. >> >> Regards. >> >> -- >> Carlos sanchiavedraz >> * Musix GNU+Linux >> http://www.musix.es > > A few steps ahead more. > > I red again the wiki and got to start Jack with the onboard soundcard > just as it says: jackd -d dummy. > > Then I tried to start jack with the UA25EX. I pluged the usb/power > cable to a laptop this time, instead of using the mobile usb charger > as before, and RPi doesn't reboot. Great. > Now I tried to start jack on RPi through Qjackctl on the laptop with > ssh -X. Jack crashed every time. I tried on RPi itself and same thing. > Then I checked jack log, ps -A and realized that pulseaudio was > running and jack couldn't have access to the device. I made a quick > search and then I made two things: > > 1) created a config file to prevent pulseaudio to restart every time > It is killed: ~/.pulse/client.conf with "autospawn=no" inside. > > 2) kill pulseaudio with "pulseaudio -k" when I run jack, and > configured same thing on Qjackctl preferences to execute it before > starting jack. > > So now I have an RPi that can start jack using UA. > But now there is the next problem: jack starts ok but when I try to > connect any program (sooperlooper i.e.) or just system-in to > system-out ports the driver crashes (that what messages say), lights > on UA switch off and, oddly enough, jack still running. > > That's it for the moment. > > > > > > -- > Carlos sanchiavedraz > * Musix GNU+Linux > http://www.musix.es One step more, this time with success. Given the situation mentioned before I tried to step back a little. First, I tried only to run jack using jackstart script again. A few tweaks and could make jack to work, but sound had glitches and crackles whatever config I tried. Second, I stepped back a little more. I executed again Ampbrownie setup.sh with option 2 (update and install additional packages). During this it changed jackd2 to jack1 uninstalling it. This could be installed before as a dependence of some of the apps I installed in addition to those that setup.sh script install (maybe sooperlooper or rakarrack, not sure). Then, I noticed during rebooting that USB is only 1.1, so I changed the hardware switch on the back of the UA from advanced driver to normal. One more reboot and... Voila! Sounds was almost perfect and delay acceptable, practically RT, connecting in to out and using Rakarrack with some basic effects. Don't know if this success is due to some newer versions it appears to have been updated on repos that are newer than those installed on first run of setup.sh, or maybe some of the modifications mentioned flicked the switch. I made a backup with dd, of course, and I'm moving towards setting up RPi as a Jam/Improv/Live headless station: boot an then run Rackarrack as a multifx connected to Sooperlooper/Freewheeling as a looper, using an external audio card and a MIDI-USB pedalboard. And then improving step by step until reaching the limit on RPi processing and overclocking. In the future I have more plans in mind, but for now that's it. BTW, I managed to connect a second usb device without RPi rebooting because of problems with power with two USB power adapters. So now I have: - 1 USB power adapter to the RPi, - 1 USB stick for the system partition on USB port1, - 1 4 USB hub on USB port 2 (where external audio card and MIDI-USB pedalboard is connected) - 1 USB power adapter to the second mini-USB port on the MIDI-USB pedalboard that helps to feed it and to stable the overall setup. I think both USB power adapters are mobile adapters, I think 0,7A and 0,5A, so maybe with just one USB power adapter at 2A for the RPi I could connect all this and a qwerty keyboard and something else, which now I can't. That or just a powered USB hub, but that is more expensive. Hope it helps. Thanks all and Regards. -- Carlos sanchiavedraz * Musix GNU+Linux http://www.musix.es

10 years, 12 months

Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency audio

by hermann meyer

Am 14.05.2013 01:16, schrieb Nicola Di Marzo: > On Mon, 2013-05-13 at 19:23 +0200, hermann meyer wrote: >> Am 22.04.2013 10:46, schrieb Carlos sanchiavedraz: >>> 2013/4/19 Nicola<nicola.di.marzo(a)vodafone.it>: >>> I was able to run guitarix gui on nexus7 with those 2 apps but the >>> result wasn't good at all. It's ok to run xterm or that kind of simple >>> gui stuff... But yeah i also will look for some midi-wireless app to >>> use it like a controller as you suggested ;-) We still have 2 other >>> possible ways to try to control it with "touch"...with gui (with >>> ubuntu) or midi (with android or ubuntu) :-) >> Andreas Degert (one of the core developers in the guitarix project) have >> added now a web interface/socket for guitarix, and make the --nongui >> mode real headless so that a running X-server isn't needed any more. The >> web interface is basic for now, but you can use it already on your >> android device as well. > That's brilliant, i would like to try it ASAP! >> (What a fun to have the tuner running on the HTC device while guitarix >> is running on the . . , well here it is my PC. :-) >> Andreas have added some more stuff in our git repository related to run >> guitarix smooth on a Raspberry Pi >> (vectorization of the dsp parts for example, . . . ). >> So if you interested in running guitarix on your PI, i would suggest you >> to stay close to our git, and join our forum or the dev-mailingliste to >> come in touch with Andreas. > Are you suggesting to follow the linux audio developer mailing list, > right? No, i mean the guitarix-developers-mailing-list here, Andreas didn't follow LAU / LAD so close. Now, it is the right time to have some influence on how things get worked out for the use-case "Raspberry Pi". :-) greets hermann > I'm totally interested about this so i'll join the forum and i will take > a look at guitarix-git as well. > Thanks hermann, great news! > >> greats >> hermann >> >>

10 years, 12 months

Fwd: Re: Raspberry Pi and real-time, low-latency audio

by Nicola

Il 18/04/2013 19:26, Jeremy Jongepier ha scritto: > On 04/18/2013 02:59 PM, Nicola wrote: >> Hi, thanks for sharing. >> The idea is simply brilliant and it works quite smoothly following the >> wiki[1] (Thanks again Jeremy!), i've got a UA25EX[2] and a Terratec >> Aureon dual-usb[3]. > > Hi Nicola, > > You're welcome! To me the RPi is just another device running Linux. > And if it runs Linux it can run JACK and some of my favorite software. > I'm sometimes baffled by the immense detour people are taking just to > get 8 note polyphony out of the RPi for instance. Or using some > real-time effects. Or building a drum sequencer. All the stuff is > already there! But no, apparently they prefer to reinvent the wheel. That's great, "keep it simple" i should say...that's why i think it's brilliant! >> Just a couple of things i noticed: >> >> 1)Using the nexus7 power adaptor everything works fine, it's a 5w 2.0A. >> 2)if you run jack with following command as the wiki suggested "jackd >> -P70 -p16 -t2000 -dalsa -dhw:UA25 -p128 -n3 -r44100 -s" make sure to add >> the background "&" at the end of the line, without this the sound was >> lousy and glitchy, at least for my UA25EX. > > So if you don't run it in the background sound is lousy and glitchy? > That's weird as it shouldn't make a difference? I did find that > raising JACK's rtprio even more (I'm now using 84) decreases the > number of glitches. yeah, that's what happened to me and i still don't know why. I'll try to increase the rtprio as well, good tip, thanks! > >> 3)Using this usb wireless adapter[4], so in a headless fashion, i had >> many jack's disconnection no matter what frames/periods i choose.Any >> suggestion to improve it? > > At the moment, no. I don't have any experience with WiFi dongles and > the RPi. I should give it a try. "Unbinding" the device to the controller it's not a good idea i suppose,the PI shares both usb ports with same controller... >> 4)I really love the tubescreamer in guitarix, it sounds GREAT! > > It sure does. I for one can't do without the Treble Booster though :) > >> 5)I've got my PI amp now saved in a separate sd card, now i'm able to >> switch my pi from a server into an amp by just replacing the sd card, >> how lovely it is!? >> >> p.s. I was thinking to install Ubuntu on my nexus7 to control Guitarix >> (headless through ssh -X) with the touch screen!!! >> > > Great idea! I've got a bricked tablet lying around too and supposedly > it can run Ubuntu too. Keep us posted on anything that comes out of this! Maybe there's no need to install Ubuntu. I found out that there are 2 apps: "Connectbot" and "X server" in the market that that may do the job with android. Connectbot doesn't provide the "-X" option so we should set up the DISPLAY variable accordingly with the ip-port on the X server app. Maybe i'm just wasting my time but i will give it a try... > > Jeremy > >> [1]http://wiki.linuxaudio.org/wiki/raspberrypi >> [2]http://www.rolandus.com/products/details/970 >> [3]http://www.amazon.co.uk/Terratec-Aureon-Dual-USB-Notebook/dp/B000WL23KC/ref=sr_1_1?ie=UTF8&qid=1366289839&sr=8-1&keywords=terratec+aureon+dual+usb >> >> >> [4]http://www.edimax.co.uk/en/produce_detail.php?pd_id=328&pl1_id=1&pl2_id=44 >> >> >> >> Nicola > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user(a)lists.linuxaudio.org > http://lists.linuxaudio.org/listinfo/linux-audio-user -- "Happiness only real when shared" C. J. McCandless

10 years, 12 months

fmit from AUR

by Ralf Mardorf

Hi :) does fmit work on anybody's 64 bit architecture Arch Linux machine? There seems to be a bug or user error ;) here. "fmit 0.99.2-2 does receive an audio signal, but the tuner doesn't work. IIRC fmit is the Linux tuner that usually does work as good as my Boss TU-12H, it doesn't fidgeting and it tunes guitars well tempered. I tried Rakarracks tuner, but regarding to fidgeting, it's impossible to tune my e. guitar. FWIW pitch-to-midi conversion does work amazingly good." - https://aur.archlinux.org/packages/fmit/ Regards, Ralf

10 years, 12 months

[ANN] Praxis LIVE build:130508

by Neil C Smith

Hi All, A new build of Praxis LIVE is now available for download. Praxis LIVE is an open-source, graphical environment for rapid development of intermedia performance tools, projections and interactive spaces. This release brings a range of new features for the video pipeline, OSC control, some major editing improvements (including copy & paste - who knew that would be so difficult to implement! :-) ), and the rather obviously missing stereo sample player, amongst many other tweaks and bug fixes. Praxis LIVE is available as a Linux .deb package, Windows .exe installer and as a .zip for un-installed usage (installed usage is recommended). Website (with downloads and manual) - http://code.google.com/p/praxis Release notes - http://code.google.com/p/praxis/wiki/ReleaseNotes Some of the new features are conspicuously under-documented at the moment. I'll improve this over the next few weeks, but feel free to fire questions via email. Best wishes, Neil -- Neil C Smith Artist : Technologist : Adviser http://neilcsmith.net Praxis LIVE - open-source, graphical environment for rapid development of intermedia performance tools, projections and interactive spaces - http://code.google.com/p/praxis OpenEye - specialist web solutions for the cultural, education, charitable and local government sectors - http://openeye.info

10 years, 12 months

Re: [LAU] Another song made with free software

by Len Ovens

On Thu, May 9, 2013 11:07 am, Giorgio - Audiophilo wrote: > Hi everybody, > just wanted to share another song made at my studio (T.Rex Studio). It's a > cover of the well known song by Gotye, "Somebody that i used to know". > As usual i worked only with free software and some external tools > Unfortunately the guy that made the video works with a Mac :( > Cheers! > > http://www.youtube.com/watch?v=TS8DZxiPtMg Wow, harsh. As it should be. Both the music and the video capture the emotion of the song very well. It feels very real. Always good to hear "real" music. Thanks for sharing. -- Len Ovens www.OvenWerks.net

10 years, 12 months

Re: [LAU] [ANN] - Introducing the MOD - Your LV2 plugins at your feet

by hermann meyer

Am 02.05.2013 22:34, schrieb Gianfranco Ceccolini: > Dear Linux Audio users and developers > > > We at AGR/HackLab are very proud to announce our newest creation: the MOD. > > > In a nutshell, the MOD it is a programable Linux based hardware > processor/controller with LV2 support. > > > It’s main objective is to take the processing of any LV2 plugins to > the stage. > > > We will make a presentation at the 2013 LAC on saturday 11 of may, at > 17:10. We hope to see some of you guys there! > > > To make things more interesting there we also created the following > > > - MOD Cloud, an online plugin repository > > - MOD Social Network, a place where MOD users can exchange their > virtual pedalboards > > - MOD SDK - a software development kit > > - Control Chain - a hardware interface for external controllers > > > You can see all costumer related info on the website > www.portalmod.com/en <http://www.portalmod.com/en> and you can watch a > video of the prototype working here > http://portalmod.com/blog/2013/03/video-1-testando-o-prototipo/ > > > The core software inside the MOD is Open Source and is being published > at github (https://github.com/portalmod). > > [....] > We hope you all like what we are doing and we would love to discuss > further details with you. > > Kind Regards > > Gianfranco Ceccolini > The MOD Team Hi Gianfranco Oh yes, I love it. :-) That seems to get a real interesting project which you guys have started out there. Congratulations and respect. regards hermann

10 years, 12 months

ANN: New Quicktoot

by Patrick Shirkey

We are please to announce a new Quick Toot. The AC3 Test Suite for ALSA http://quicktoots.linux-audio.com Cheers -- Patrick Shirkey Boost Hardware Ltd

10 years, 12 months

Monophonic pitch-to-MIDI converters for Linux

by Ralf Mardorf

Hi :) right now I'm testing Rakarrack. I already played Yoshimi by guitar-to-MIDI, using Rakarrack's converter and it seems to be worth to continue testing :). Are there other pitch-to-MIDI converters available for Linux? Are there any secret tricks, to improve the guitar-to-MIDI conversion? $ pacman -Q guitarix-git guitarix-git 20130507.2031-1 Regards, Ralf

10 years, 12 months

Sorry for the Double Post

by Kevin Utter

Hi all! I'm sorry, I don't know quite how I sent the same message twice, but I apologize. Thanks much. Kevin

10 years, 12 months

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Linux-audio-user May 2013