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This might come as an end to a long cycle indeed, really approaching a
final and last milestone, whatever...
But one thing is for sure: besides the prodigal but (pun, somewhat,
not intended:)), this wraps up the so called Qstuff* Fall'16 release
business deal .
Qtractor 0.8.0 (snobbiest graviton) is out!
And the release highlights are:
* Auto-backward location marker (NEW)
* Clip selection edge adjustment (NEW)
* Improved audio clip zoom-in resolution (NEW)
* Clip selection resilience (FIX)
* MIDI (N)RPN running status (FIX)
And the band plays on...
Maybe you can further decrypt the fresh juice from the change-log
below -- or rather never mind though and go for the grabs already ;).
Qtractor  is an audio/MIDI multi-track sequencer application
written in C++ with the Qt framework . Target platform is Linux,
where the Jack Audio Connection Kit (JACK ) for audio and the
Advanced Linux Sound Architecture (ALSA ) for MIDI are the main
infrastructures to evolve as a fairly-featured Linux desktop audio
workstation GUI, specially dedicated to the personal home-studio.
- - source tarball:
- - source package:
- - binary packages:
Wiki (on-going help wanted!):
Qtractor  is free, open-source Linux Audio  software,
distributed under the terms of the GNU General Public License (GPL
) version 2 or later.
- - MIDI clip tools redo/undo processing refactored as much to avoid
replication over multiple hash-linked clips; MIDI clip editor's
floating selection/anchor event stability has been also improved, in
regard to MIDI tools processing range.
- - Auto-backward play-head location, when playback was last started, is
now shown on main track-view, as a momentary dark-red vertical line
- - LV2 plugin-in parameter optimization: stuff consecutive series of
plug-in's parameter value changes, as much as possible into one single
- - LV2_STATE__StateChanged is now recognized as a regular atom
notification event and raising the current session dirty flag, as
- - Adjusting clip selection edges is now possible and honored while on
the the main track-view canvas.
- - Audio peak file caching and rendering, as far as audio clip
wave-forms are concerned, have been refactored and optimized a couple
of notches higher, on the ephemeral and rather marginal throughput
- - Fixed a potential crash on the singleton/unique application instance
- - Edit/Select Mode tool-buttons moved into single drop-down
tool-button on the main and MIDI editor's tool-bar.
- - Do not reset the current clip selection when updating the main
track-view extents eg. while zooming in or out.
- - Automation curve node editing auto-smoothing revisited; also fixed
input MIDI RPN/NRPN running status processing, which was crippling
some plug-in automation curve nodes, when saved in high-resolution
- - Fixed the visual play-head position (vertical red line) while
zooming in or out horizontally.
- - Almost complete overhaul on the configure script command line
options, wrt. installation directories specification, eg. --prefix,
- --bindir, --libdir, --datadir and --mandir.
- - LV2 Plugin-in worker/schedule fix: make request/response ring-buffer
writes in one go, hopefully atomic (suggested patch by Stefan
Westerfeld, while on SpectMorph, thanks).
 Qtractor - An audio/MIDI multi-track sequencer
 Qt framework, C++ class library and tools for
cross-platform application and UI development
 JACK Audio Connection Kit
 ALSA, Advanced Linux Sound Architecture
 Linux Audio consortium of libre software for audio-related work
 GPL - GNU General Public License
 The QStuff* Fall'16 Release
 Vee One Suite 0.8.0 - A Fall'16 Release
Enjoy && Keep the fun.
rncbc aka Rui Nuno Capela
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I try to get bit-transparent playback/recording of a stereo stream with
a RME 9632 card.
My test setup the card clocked at 48 kHz and the AES input and output
When I tried to use pure alsa, I recorded 10 channels to get channels 9
and 10 which is the AES input (I wasn't able to find a way to record
only channels 9 and 10). However, I'm not able to play back anything
during the recording. I get the error message "set_params:1361: Unable
to install hw params".
I also tried jack and started jackd this way:
$ jackd -R -d alsa -d hw:DSP -z none -M -H
I was able to play back a square sample and record channels 9 and 10
using jack_rec. However, the result looks like it went though bad AD/DA
conversion: jumpy edges and the linear parts unclean, too.
I'll try to find out if the playback or recording part is the culprit.
However, I'd like to get some comments if bit-transparent
playback/recording can work at all with my setup. If it does, I'd
appreciate to get some hints how to achieve this.
I have an issue with xjadeo video monitor. its all running fine, but
when I put it on fullscreen on a windows system with 3 screens connected
(vertical span mode) the video just goes fullscreen on the primary
screen and not over all 3 screens as expected. but with the vlc player
it just works fine and plays the panoramic video over all screens perfectly.
does anybody know if there is an option to span the fullscreen picture
of the xjadeo video player over the 3 screens?
I would appreciate any input very much, as this is a showstopper for our
project and I cannot find any information online.
thanks in advance for the help,
peyotecross design GmbH
I'm working on fixing this issue:
in libsndfile. In order to figure out what's what, I need a WAV file
loop, with an embeded ACID chunks, and the loop needs to be in a time
signature *other* than 4/4.
If you think you may have a loop that would be useful for me, you can
verify it using the sndfile-info program that ships with libsndfile
(its in the sndfile-programs package in Debian/Ubuntu). Running
on candidate WAV files produces something like this:
$ sndfile-info file.wav
File : file.wav
Length : 146982
RIFF : 146974
fmt : 16
Format : 0x1 => WAVE_FORMAT_PCM
Channels : 1
Sample Rate : 44100
Block Align : 2
Bit Width : 16
Bytes/sec : 88200
data : 145408
LIST : 110
ICOP : Paul Bennet, 1999
ICRD : 1998-09-21
IENG : Paul Bennet
ISFT : Sound Forge 4.0;Sound Forge 4.5
acid : 24
Flags : 0x0002 (Loop,RootNoteValid,StretchOff,RAMBased,??Off)
Root note : 0x34
???? : 0xFFFF8000
???? : 0.000000
Beats : 4
Meter : 4/4
Tempo : 145.576584
strc : 1372
What I need is a file with "Meter" of something other than 4/4.
If you have one, please email the sndfile-info output to me at erikd
at mega-nerd.com. I might also get you to email me the file if it looks
like it might help.
Sample Rate : 44100
Frames : 72704
Channels : 1
Format : 0x00010002
Sections : 0
Seekable : FALSE
Duration : 00:00:01.649
Signal Max : 32767 (-0.00 dB)
Erik de Castro Lopo
for the shake of easiness I've pushed a release of screcord.lv2 to github.
screcord.lv2 is a ultra light LV2 recording plugin, which will save your
audio stream to disk.
screcord features stemless recording, means it open a new file when max
file size of wav file is reached.
screcord comes without GUI, but provide a record button, a format
selector, and a clipping indicator.
screcord use libsndfile http://www.mega-nerd.com/libsndfile/
Please excuse x-posting:
Virginia Tech is seeking graduate student candidates for a competitive
Institute for Creativity, Arts, and Technology (ICAT) graduate research
assistantship starting with the academic year 2017-8. We are
specifically looking for students who are interested in studying in the
newfound Human-Centered Design (HCD) transdisciplinary individualized
PhD and/or Computer Science's Human-Computer Interaction (HCI). We are
also willing to consider Masters level applicants to the CS program with
focus on HCI. Additional assistantships may be available through the HCD
Virginia Tech's new individualized Human-Centered Design (HCD) iPhD
transdisciplinary degree is closely aligned with the newfound Institute
for Creativity, Arts, and Technology (ICAT). iPhD is a degree designed
primarily to support individually tailored PhD experiences, allowing
students to actively participate in shaping their plan of study.
CS HCI Option
The graduate program in the Department of Computer Science at Virginia
Tech is on its way to becoming one of the top programs in the country.
The resources and facilities for research areas such as human-computer
interaction, bioinformatics, and high-end computing are state of the
art, and the growing list of specialized masters and doctoral degrees in
a variety of areas provides opportunities for students to concentrate
their research and study on the specific aspects of computer science in
which they are most interested. At Virginia Tech, students receive
firsthand instruction by award-winning faculty. In the computer science
department, that means that graduate students have the opportunity to
learn from the professors who have helped to define today's computer
industry. The Center for Human-Computer Interaction is a part of ICAT,
offering a diverse infrastructure and human expertise for cutting-edge
The GAship in question seeks candidates with a solid research
background, and a strong sense of independence and self-sufficiency. We
are particularly seeking students interested in sonification, sound
spatialization, and interactive technologies (e.g. mind-body
technologies, laptop/mobile ensembles, hyperinstruments, installations,
mobile/wearable/physical computing, etc.). Knowledge of Max and
Pd/Pd-L2Ork programming environments, C/C++, Java, or equivalent is
strongly preferred, as well as skills in other domains (e.g. interactive
multimedia, K-12 education, 3D animation, etc.).
This is a renewable assistantship with a full tuition waiver and
a stipend. To be eligible candidates need to apply, be accepted, and
enroll in the new HCD iPhD or the Human-Computer Interaction Computer
Science program with primary focus in the computer music domain focusing
on one or more of the aforesaid areas of interest.
The successful candidate will be given an opportunity to participate in
conducting research using the cutting edge 148 speaker system and
consequently its innovative spatialization, sonification, and immersion
approaches in the new $100M Moss Arts Center and more specifically
Institute for Creativity, Arts, and Technology's three-story Cube space
and its smaller counterpart, the immersive Perform Studio, as well as
the new DISIS facilities, a part of a $600,000 renovation that opened in
January 2015. They will also work closely with ICAT faculty and
students on a number of collaborative projects.
For questions and application information please contact Dr. Ivica Ico
For more information:
Ivica Ico Bukvic, D.M.A.
Creative Technologies in Music
ICAT Senior Fellow
DISIS & L2Ork Director
School of Performing Arts – 0141
Blacksburg, VA 24061
I was recently thinking about how powerful, yet maybe underestimated,
the JCAK freewheel mode  is.
As far as I know this is used by Ardour, Qtractor and MusE for
Call me old school, but I like to use various (lots) of audio software
on Linux in a modular way. I have stated many times that, in my humble
opinion, modularity plus inter-connectability of applications though
JACK is, from a creative point of view, a killer feature.
So, coming to the freewheel point. Wouldn't it be great if 'all jack
audio' software were freewheel-ready, so that if I activate a switch,
all applications enter freewheel mode and when I activate recording in
my favourite DAW, connected to some of my favourite (standalone!)
synths, connected to my favourite sequencer, everything is recorded
'faster than realtime' in the DAW?
Or also: isn't it startling that in the digital era one should 'record'
stuff internally in real-time??
What kind of work/burden would becoming freewheel-ready pose on existing
I do can see some cases where this just wouldn't work or might not even
be desirable: for example Pure Data and similar software which by
definition is realtime.
Hopefully this can start some (civilized!) debate on the topic and it
also includes other topics such as (creative) workflow, etc.
Just a quick note to say my new album (Patchwork Cacophony, Five of Cups)
was released today.
Once again, almost everything was produced on Linux using Ardour and other
Open Source software (though there are very few soft synths -- it's mostly
olde fashioned drums, guitars, voices and physical keyboards).
Same as last time, if anyone mentions Ardour when buying a copy I'll
collect up £1 per sale for a donation to Ardour development. In truth with
music sales being what they are these days it's unlikely to feed a proper
developer caffeine habit for even a week, but it should be able to eclipse my
all-time revenue from Spotify ;)
The music is prog rock, with a strong emphasis on keyboards and classic-era
sort of sounds rather than more metal-influenced which is seeing a bit of
a rennaissance these days.
You can stream the whole thing for free on Bandcamp:
Thanks again to everyone in the Linux Audio world, from the ALSA and FFADO
guys, obviously Ardour, but also things like Scribus and Gimp. It constantly
amazes me how much support there is for producing a thing like this without
recourse to proprietry software. Long may it continue!