Linux-audio-user March 2012

linux-audio-user@lists.linuxaudio.org

114 participants
122 discussions

by Fons Adriaensen

Hello all, I wonder if I'm the only one experiencing this problem with Qjackctl. Anyway I haven't seen any other reports of it. The problem is so obvious that I myself never bothered to report it - it's the thing you exect fixed in the next release. But apprently it never gets fixed. To the facts now: almost every day when I use it, and for the last years, Qjackctl get into some cramp in which it either - refuses to make some connections, - or refuses to show them, - or makes them and then disconnects them immediately. I don't know what triggers this, but it could be related to apps making lots of ports connections in a short time and Qjackctl's idea of current connections getting out of sync with reality. Given Jack's APi for this that is no big surprise, but what really messes up things is that Qjackctl apparently has no means to recover and refresh its connections database from scratch. The only option is to terminate it (which takes Jack and all apps with it, unless Jack was started separately). Ciao, -- FA Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.

13 years

csound segfaulting with the vco ladspa plugin

by Julien Claassen

Hello everyone! I've been experimenting some with Fons' vco_pulse.so or blvco.so. Both have the same plugins and I've tried both, but it realiably segfaults, without any warning. There's nothing untoward in the messages, even with debugging for dssiinit turned on. Has anyone else experienced that? My csound version is 5.13 (beta) with with libsndfile 1.0.24-exp. It's self-compiled. I've checked the example from the manual using the g2reverb.so and that works. Here's my minimal orchestra file: < basic header info sr = 44100 ; samplerate kr = 4410 ; controller rate ksmps = 10 ; sr/kr nchnls = 2 ; number of channels i.e. stereo gihandle dssiinit "blvco.so", 2, 1 ; init plugin 2 from blvco.so ; also turn on verbose mode instr act ; instrument for plugin activation (this always needs to be done!) dssiactivate gihandle, 1 endin instr 1 ; instrument for the work afreq init 200 ; set up an audio signal for frequency control, this must be ; an audio signal, this is set to 200 statically a0 init 0 ; have an audio signal just saying 0 a1 init 1 ; have an audio signal fixed at 1 ; set all teh control ports (we first have 5 audio inputs starting at 0) ; the last parameter tells us to set this value immediately dssictls gihandle, 5, 0, 1 ; octave dssictls gihandle, 6, 0, 1 ; tune dssictls gihandle, 7, 0, 1 ; exp FM dssictls gihandle, 8, 0, 1 ; lin FM dssictls gihandle, 9, 0, 1 ; wave form dssictls gihandle, 10, 0, 1 ; form mode dssictls gihandle, 11, 1, 1 ; lp filter aout dssiaudio gihandle, afreq, a1, a0, a0, a0 ; create audio output ; all the a0's are for the remaining audio inputs outs aout, aout ; output the stereo signal endin The score file would be: i "act" 0 2 ; initialise the plugin i1 1 3 ; get some audio output e ; finish score Any ideas? Is it perhaps repeatable? Warm regards and thanks Julien =-=-=-=-=-=-=-=-=-=-=-=- Such Is Life: Very Intensely Adorable; Free And Jubilating Amazement Revels, Dancing On - FLOWERS! ====== Find my music at ====== http://juliencoder.de/nama/music.html ..................................... "If you live to be 100, I hope I live to be 100 minus 1 day, so I never have to live without you." (Winnie the Pooh)

13 years

IR LV2 / convolution reverb

by rosea.grammostola

Hi, Where can I find info to grasp a bit about how to work with the IR LV2 plugin or convolution reverb (jconvolver) in general? \r

13 years

connect ports with jack1 vs jack2 (was: Re: Qjackclt cramps)

by Giso Grimm

Hi Robin, On 03/08/2012 02:25 PM, Robin Gareus wrote: > On 03/08/2012 11:59 AM, Giso Grimm wrote: > [..] > Hi Giso, > > Getting off topic, but I'm curious: Earlier jack1 aka jack-0.X versions > can produce clicks or even x-runs when connecting ports. Is that still > an issue with 0.121.2 ? Neither jack 0.121.2 nor jack 1.9.7 does produce xruns (like those reported by jack when it is not fast enough to handle the sound card data). > >> jack 1.9.7 >> >> giso@helios:~$ time (for k in system:playback_{1..26}; do jack_connect >> system:capture_1 "$k"; done) >> >> real 0m3.729s >> user 0m0.056s >> sys 0m1.645s > > ..and how many audible clicks, xruns? no audible click, no xrun > >> jack 0.121.2 >> >> giso@helios:~$ time (for k in system:playback_{1..26}; do jack_connect >> system:capture_1 "$k"; done) >> >> real 0m0.198s >> user 0m0.031s >> sys 0m0.107s > > ..and how many audible clicks, xruns? > sometimes one audible click, no xrun (sine test tone on an independent signal graph) btw, the time seems to scale with the fragment size: 1024 samples/fragment: giso@helios:~$ time (for k in system:playback_{1..26}; do jack_connect system:capture_1 "$k"; done) real 0m2.419s user 0m0.029s sys 0m0.811s 4096 samples/fragment: giso@helios:~$ time (for k in system:playback_{1..26}; do jack_connect system:capture_1 "$k"; done) real 0m9.677s user 0m0.017s sys 0m0.823s Glitch-free connections are nice, but jack sessions with several hundred ports/connections make jack2 nearly unusable in terms of connection time :-( It looks as if it would take four cycles to complete a port connection. I think here is some space for improvement (e.g. allow asynchronous connections and return immediately from jack_connect), but maybe this will come with all the session management solutions... (actually both versions have their pros and cons, which is the reason for me to switch often between them, depending on my actual needs). Giso

13 years

Music made with Linux: What happened in the middle?

by Stuzz

Good morning "What happened in the middle?" is the title of my RPM Challenge entry. For the uninitiated, the RPM Challenge is an annual motivation album writing event with a simple rule: write and record 10 songs (or 35 minutes worth) of music in the month of February. This was my first time taking part and I was happy enough with the results to release it as my debut album on Bandcamp: http://stuzz.bandcamp.com All sounds were recorded with a recent svn of Ardour3 All drums were programed with Hydrogen using the GCSW-2 kit for all but "Let It Slide", where I used the Big Mono kit. As usual with Bandcamp, you can stream the lower quality audio, or if you Buy Now for $0 or above, you can choose the quality you want, all the way up to FLAC. It's a bit rock, a bit metal, and a few other things. My favorite songs are 04-Around You, closely followed by 09-From the Flames. The album is released under a Creative Commons CC-BY-SA 3.0 license. Hit me up if you want to know any details about the putting together of the album. Comments, suggestions and anything else is also welcome and encouraged. Regards Stuzz http://stuzz.bandcamp.com

13 years

HW Synth editor in a virtual machine ?

by jonetsu

Hi all, Do these softwares that comes with hardware synths to help editing sounds usually work inside a Virtual Box (or VmWare) virtual machine ? The idea is to run Virtual Box on Linux (Virtual Box with a version of Windows) for those times when editing sounds is required. Specifically, this would be for the KORG Microstation that I'm considering getting. The connection is made via USB so it should be easy I presume to let a USB connection reach Virtual Box. KORG also has some sort of (VST ?) plug-in although that might be more complicated to get working with Ardour/Wine. If not, let me know. or, would it run straight under wine w/o the need of a full VM ? I wonder. Anyone using such software ? Any comments appreciated, thanks.

13 years

[lists@wolfdream.ca: Re: slow operation of jack_connect (was Re: connect ports with jack1 vs jack2)]

by S. Massy

Sorry, replied to sender by mistake. S.M. --

13 years

ecasound/nama signal path queries

by James Mckernon

Hi all, I have a few questions about using ecasound and/or nama with slightly more complex, 'non-linear' chains of audio effects. By this I mainly mean 'forking' chains - such as highpassing a signal and applying a delay loop to the high-frequency components of the sound, and a distortion to the rest, for example. This kind of thing would generally be straightforward enough to implement in hardware with physical cables, but elegant implementations in DSP seem rarer -- at least in linux. One of the reasons I am interested in ecasound is that I gather from its 'examples' webpage that it handles exactly this kind of thing quite elegantly: 'Ok, let's next do some parallel processing: two chains are created and the input and output files are connected to them. As a result, the input signal is processed with two sets of effects, and then mixed back together. You can create as many chains this way as you want.' ( http://www.eca.cx/ecasound/Documentation/examples.html#effects) However, I suspect that ecasound in its raw form could be somewhat unwieldy for the sort of work I'd like to do, so I'd like to be able to use nama instead. Would this sort of 'forking' signal chain be as easy to set up in nama as it seems to be in ecasound? Also, in nama, is it possible/easy to adjust and play with the effects path (and effect parameters) on the fly, without interrupting playback? Relatedly, another thing I'd like to be able to do is a delay effect, with effect(s) (i.e. filters or certain kinds of distortion, followed by a gain reduction) applied 'inside' the delay loop, such that the effect is recursively, cumulatively applied to the looped material. Might sound like a strange requirement, I know, but it's actually a fairly central effect to the kind of music I'd like to make (dub reggae). Unfortunately, this is difficult to achieve easily in Linux. Since no delay plugin that I know of includes the kind of internal effects that I want, the only way to achieve this is with some kind of 'circular' DSP chain, which most programs don't allow. Does anyone know if this kind of 'circular' DSP chain might be achievable in any way in ecasound - for example, by feeding a track's output back to itself? Any tips on achieving either of the above with other programs welcomed, too! Thanks, all! James

13 years

ANN: pd-l2ork v.20120306 bug-fix release now out

by Ivica Ico Bukvic

A few minor bugs crept into the new tooltip implementation, so 20120306 version is now out. Tooltips now support both dockable behavior for the manual tooltips and cursor-centric text bubbles for dynamic tooltips. Also, all the shortcomings of tcl/tk's Enter/Leave events has been circumvented by using C implementation of tooltips. Other improvements include scalable fonts, removal of redundant tooltips, and correct offset calculation for objects. http://l2ork.music.vt.edu/main/?page_id=56 Pd-l2ork can be also found on git at https://github.com/pd-l2ork Cheers! Best wishes, Ico

13 years

Music made with Linux: Airship - A 16bit Soundtrack Theme

by Nils

Hello list, I would like to share a piece I've just finished. The original blog entry is here, but for your convenience I'll include a copy into this mail. Feel free to use any channel you want if you would like to comment on it. http://www.nilsgey.de/2012/02/29/airship-theme/ Airship - A 16bit Soundtrack Theme direct download: http://www.nilsgey.de/uploads/NilsGey-AirshipTheme.mp3 I have finished my first just-for-fun composition since a very long time ago. It is a game-soundtrack like piece I named “Airship”. I can imagine this in a Japanese 90’s RPG from the SNES or Sega Genesis/MegaDrive era. Software used: Laborejo composition and midi generation, Fluidsynth for midi to wave rendering and Ardour for the fadeout :) . I used an .sf2 called Setzers SPC which I have downloaded here. I am not sure about the soundfonts legal status so I am careful and release the Airship Theme not as a free piece but just as: Listen to it freely, share and redistribute it but don’t use it in any work, derived or original, or as part of a game or video etc. Don’t do anything commercial with it and don’t change the mp3 tags. If you find a named, matching License to this description feel free to use that instead. I would be very happy if you leave a comment or click this blogs “Like” button. Greetings, Nils http://www.nilsgey.de http://www.laborejo.org

13 years, 1 month

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Linux-audio-user March 2012