Linux-audio-user April 2013

linux-audio-user@lists.linuxaudio.org

111 participants
126 discussions

rtirq update - 2013 edition (was: rtirq as systemd service?)

by Rui Nuno Capela

(apologies for the x post) > On 03/30/2013 11:50 AM, Simon Lewis wrote: > > Since fc17 upwards uses systemd and not sysvinit, should rtirq be made a > systemd service? > rtirq has been updated for both old sysvinit and the new systemd support. upstream packages available: http://www,rncbc.org/archive/#rtirq http://www,rncbc.org/archive/rtirq-20130402.tar.gz http://www,rncbc.org/archive/rtirq-20130402-31.src.rpm http://www,rncbc.org/archive/rtirq-20130402-31.noarch.rpm cheers && thanks -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

11 years, 8 months

'Modular' midi controller for keyboard

by rosea.grammostola

Hi, I'm looking for something which I can use together with my 88keys masterkeyb without knobs. It would be nice if it's small and light enough to put on my keyboard itself. Something like the evolution uc-16, but it would be nice if I could route my midi masterkeybd via the controller to the computer (midi in / midi out / midi thru (?). I like to control stuff like setBfree and some effects in Non-Mixer probably. Thanks in advance, \r

11 years, 8 months

Terrible mic ground noise

by jonetsu＠teksavvy.com

Hello, There is a very bad ground noise when I connect the M-Audio pulsar mic into a mic input of the 1010LT. As soon as I touch the mic, the ground noise disappears. Complete silence. But then, try to play bass like that. The mic goes through a Radial JDI passive direct box. It has the 15dB pad on because it makes a bit less ground noise. I tried various settings on the DI box, bit none gets rid of the noise. The electric plug has only two prongs. I though of getting some copper wire and somehow run a length of wire from the electric plug receptacle to a nearby set of copper water pipes. That shoudl get the rig grounded, would it ? Before getting into that or anything else, is that ground noise a factor of a cheap microphone ? Or is it the quality of the 1010LT input that uses not-so-good decoupling capacitors (or some such) ? Is it possible to have silence without getting pro hardware ? Thanks for suggestions/ideas/hints !

11 years, 8 months

[ALPHA] ladspa.m.*

by Florian Paul Schmidt

Hi, after a somewhat productive weekend I'm happy to announce some alpha quality software (i.e. bug ridden, not feature complete) for your consideration and feedback :) But: release early, release often XD I went a little overboard with modularization and separation of concerns, so in the end it became four packages (with possibly one more in the future - a LV2 plugin to load the synths/instruments). Documentation is also very much lacking, but each package contains at lease a single example file to illustrate the usage. * ladspa.m - https://github.com/fps/ladspa.m ladspa.m is a header only c++ library to build and run general synthesis graphs made up out of LADSPA plugins. The interface is kept deliberately kept simple and unsafe, as it is expected that one uses higher level tools to build these synthesis graphs (e.g. using a library on top op ladspa.m.swig or ladspa.m.proto). * ladspa.m.swig - https://github.com/fps/ladspa.m.swig ladspa.m.swig are SWIG generated python bindings for ladspa.m. This allows building and running general synthesis graphs made up of LADSPA plugins from within python. This requires ladspa.m. NOTE: I just saw that the swig interface definition lacks the ability to connect outside buffers onto plugin ports. This will be fixed in the next few days.. * ladspa.m.proto - https://github.com/fps/ladspa.m.proto ladspa.m.proto contains google protobuf definitions for general synthesis graphs made up of LADSPA plugins. It also contains a definition for an instrument file format. This library does not depend on either of the two above. It becomes useful with the last package (ladspa.m.jack) and possibly in the future with an LV2 plugin to load and run these (to be announced when done). The python bindings generated for ladspa.m.proto can be used to generate synth and instrument files that can be loaded by ladspa.m.jack. The instrument file definition allows for polyphony while at the same time putting no constraints on the inner structure of the instrument (each voice is made up out of plugins, they can be identical or not between all voices).. An example is included which defines a simple sawtooth instrument with exponential envelopes and with 5 identical voices except for a different delay setting on each voice. https://github.com/fps/ladspa.m.proto/blob/master/example_instrument.py Pipe its output into a file called e.g. instrument.pb. This you can then load into ladspa.m.jack.instrument. Here's a little example of the generated instrument file loaded into ladspa.m.jack.instrument and playing a little 120bpm loop (from ardour3) with it: https://soundcloud.com/fps-2/t-m This also highlights the need for a higher level interface on top of it to ease the process.. * ladspa.m.jack - https://github.com/fps/ladspa.m.jack ladspa.m.jack is a library which allows loading ladspa.m.proto synth and instrument definition files into jack hosts that are provided as example clients. ladspa.m.jack.synth allows loading a synth definition file and run it in the jack graph. ladspa.m.jack.instrument allows loading an instrument definition file and provides a midi in port which allows playing the synth. But like I said this is all ALPHA software and I just announce it because someone else might have fun with it. Please report all issues that you find either per email to me, on LAD or LAU or on the issue trackers of the github projects.. Have fun, Flo -- Florian Paul Schmidt http://fps.io

11 years, 8 months

[ANN] QjackCtl 0.3.10 - The singing swan rehearsals...

by Rui Nuno Capela

Who would tell or whisper such a thing? Is this an april fool's announcement? nope. QjackCtl 0.3.10 is out! Website: http://qjackctl.sourceforge.net Project page: http://sourceforge.net/projects/qjackctl Downloads: - source tarball: http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.10.tar.gz - source package (openSUSE 12.3): http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.10-2.rncbc.suse123.s… - binary packages (openSUSE 12.3): http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.10-2.rncbc.suse123.i… http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.10-2.rncbc.suse123.x… Weblog (upstream support): http://www.rncbc.org License: QjackCtl is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - Session infra-client management finally being added. - Preparations for Qt5 migration. - Transport tempo (BPM) precision display fixed to 4 digits. - Color-candy (dang old ANSI terminal?) escape sequences are now silently stripped from jackdbus messages captured log (one-liner from original patch by Brendan Jones, thanks). - List ALSA device card id. string instead of device number, while on setup dialog. - Japanese (ja) translation added (by Takashi Sakamoto). See also: http://www.rncbc.org/drupal/node/628 Enjoy && Have fun! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

11 years, 8 months

Audio mixer using a raspberry-pi and some external audio card

by Roberto Suarez Soto

Hi, I don't know if what I'm going to ask makes sense or is terribly stupid. Don't be too harsh on me if it's the latter, please :-) I've got two audio "outputs" (headphones and a 4.1 set of speakers) and two audio "inputs" (a computer and a TV). In an ideal world, I'd be able to switch between them with some sort of device: let's say I'm watching a film through the speakers but it's getting late and I want to switch to the headphones. Or I'm done with the TV and I want to do something with the computer, and want to listen to that instead. I don't know what kind of devices are used in the real world to do this, but to me it looks quite similar to what we do with Jack. So I thought that with some small Linux-capable device (hence the Raspberry-pi) and some external audio card (with two inputs and two outputs; or maybe even two different external cards, each one with one input and output), you should be able to build a DYI audio mixer for not-so-much money. You could ssh into it and use qjackctl or the like to adjust inputs and outputs. Am I completely off-mark, or is this a viable/common/established thing? Thanks in advance, -- Roberto Suarez Soto Hurt me plenty

11 years, 8 months

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Linux-audio-user April 2013