Linux-audio-user December 2010

linux-audio-user@lists.linuxaudio.org

138 participants
152 discussions

by Fabio

am I the only one who misses a fader for the metronome in the main-window? or perhaps an option to couple it to the master-fader. Fabio

14 years, 4 months

recycle users wanted

by Alexandre Prokoudine

Hello lists :) First, an introduction. Within the context of this mail I'm representing re-lab -- a small project [1] that does a dirty job developers usually try to avoid -- reverse-engineering file formats that have no publicly available specs. Our primary goal is helping dev teams and therefore end-users to support legacy data. We started with Corel DRAW back in 2007 (supported by Inkscape, sK1 and UniConvertor now), continued with painting dynamics in Photoshop brushes (supported by Krita in SVN trunk) and Photoshop gradients (supported by SwatchBooker), and now we arrive to audio domain. A while ago we asked Ardour team if they wanted some file formats reverse-engineered. Paul named a couple of such file formats, including REX2 audio loops [2]. Since we are (at least pretend to be) nice guys, we started with mailing Propellerhead, but they never replied (only to be expected, given their track record re open source teams). Well, something had to be done about that, eh? So we started looking into things. Initial version of Python scripts that parse .rx2 files and dump stuff to stdout is already available [3]. This is exactly what deliver in the end: Python scripts for parsing and a specification that explains what every chunk does. Now here is what we need. All we have right now is a bunch of .rx2 files that I got with my Focusrite Saffire Pro24 and bundled software. It's good for a start, but for proper r-e we need introducing small changes to files and seeing what's changed. So we need someone with a licensed copy of ReCycle and some spare time on his/her hands to help us figuring things out. Demo version of ReCycle works fine in WINE, but saving and loading arbitrary files is impossible. We really do not want dealing with pirated copies, because, again, we do our best to be nice guys. And since we do it not just for fun, but for actual results, we'd be glad if developers of other applications (FreeCycle and Smasher are the first I can think of) implemented support for REX2. Coincidentally we are also interested in people who are good at audio compression algorithms. *cough* Monty *cough* :) By the way, usually I don't read both l-a-u and l-a-d lists, so after a while (a week maybe) I'll turn off delivery of mails, which means you probably want using Reply to All button in your mail client of choice. [1] http://gitorious.org/re-lab/ [2] http://en.wikipedia.org/wiki/REX2 [3] http://gitorious.org/re-lab/audio Alexandre Prokoudine http://libregraphicsworld.org

14 years, 4 months

bristol synths hang

by Renato

Hello, I starte playing around with bristol synths, which look and sound very cool so far, but I'm having a problem. It happens many times that a particular note "hangs" on the synth, and sending note off events doesn't stop it... I have to restart the program, which makes it unusable since it happens quite often. Untill now this happenede with b3, minimoog and dx7. Does anyone experience similar problems? BTW I'm "playing" the synths with jack-keyboard and pressing the keys in the GUI with the mouse. renato

14 years, 4 months

Update of zita-at1 (bugfix)

by fons＠kokkinizita.net

Zita-at1 has been updated to 0.2.1 fixing a nasty bug. Thanks to Oleg Ivanenko for reporting the problem and helping to solve it. As usual: <http://www.kokkinizita.net/linuxaudio/downloads> Ciao, -- FA There are three of them, and Alleline.

14 years, 4 months

Calf plugins and the calfjackhost

by alex stone

A quick question. Is there any plan or intent to make calfjackhost jack sessionable? Alex. -- www.openoctave.org midi-subscribe(a)openoctave.org development-subscribe(a)openoctave.org

14 years, 4 months

jack-rack racks

by rosea.grammostola

Hi, Anyone who is able to open these patches in jack-rack? http://offog.org/stuff/racks/ (wget -e robots=off -r -np -nd http://offog.org/stuff/racks/ ) It seems I do miss pretty some plugins, but I thought I installed the most ladspa plugins... \r

14 years, 4 months

Re: [LAU] Converting binary digital data in PCM

by ciclo esano

Hmmm.. I have no success until now :( Using play -e raw -b 32 -c 1 -r 441000 --endian little dat.raw I am facing with the following error: play FAIL sox: --encoding: `raw' is not one of: signed-integer, unsigned-integer, floating-point, ms-adpcm, ima-adpcm, oki-adpcm, gsm-full-rate, u-law, mu-law, a-law. That's strange. I am sure the data are in little-endian format (since the storage CPU is Intel), each sample is 32-bit long integer, I have 32768 samples but have no idea about the real sampling rate. I can try with several speeds, but the question about the "encoding" still unclear for me. And this is the same using sox instead. So, I am stuck here 2010/12/11 Rob <lau(a)kudla.org> > On Saturday 11 December 2010 04:42, ciclo esano wrote: > > Moreover the information about bit rate, channel and everything > > concerning audio file is very difficult to apply here, since the raw > > data are coming from a digitizer after several downsampling processes > > to have all the signals in the audio range (in fact they arise from the > > high frequency of nuclear spins, hundreds of MHz) > > Oh, that sounds brilliant. Well, if they're being downsampled already, > surely you know what frequency to choose, but if not, you could just start > with the common ones (22050, 32000, 44100, 48000), see how they sound and > tweak as needed. I'd assume it'd be one channel and 32-bit samples based > on what you said, but you can experiment with that too. > > Rob >

14 years, 4 months

Hydrogen Jack Transport problem

by rosea.grammostola

Hi, Are the Hydrogen devs aware of Syncing problems, for example Qtractor with Hydrogen? I heard at least two people complaining about it. Imho Hydrogen looses much of it's potential when Jack Tranport is not working properly. I just want to report it, I don't use Hydrogen myself a lot these days though, so I am afraid I can't help you more then just reporting it. Regards, \r

14 years, 4 months

make uninstall, libclthreads versions,

by Peter Plessas

Dear Fons, Have you thought about adding a "make uninstall" target in your Makefiles? I have a rather hard time figuring out how to uninstall eg. libclthreads from my system. A second question: Can I have clthreads-2.4.0 and clthreads-2.2.1 installed next to each other? Thank you for all this wonderful software! best regards, P.

14 years, 4 months

Converting binary digital data in PCM

by ciclo esano

Dear guys we have a set of digital data acquired in the time domain by an analytical instrument, stored as 32-bit long integer (little-endian). Each sample contains mixed audio signals (10Hz - 20kHz) which decay exponentially in a couple of seconds. I need to convert that data in an audio format (PCM ob better WAV) which can be easily played by any multimedia player. Unfortunately I have no idea on how to start with this project. Can anyone give to me some advise? Sincerely max

14 years, 4 months

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Linux-audio-user December 2010