Show-off my open-source stuff, mostly of the Linux Audio/MIDI genre

rtirq update - 2022 edition

Hi all!

Now that the (northern) Summer'22 is ending, an update to rtirq is out:

  • Fixed grep warning stray \ before /.
  • Replace obsolescent egrep for grep -E.
  • Version 20220923.

Packages are here available as also from the repos:


Please note that the rtirq init-script/systemd-service makes sense only on real-time preemptive (PREEMPT_RT) or threadirqs enabled GNU/Linux kernels.


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Qtractor 0.9.28 - A Late-Summer'22 Release


Qtractor 0.9.28 (late-summer'22) is released!


  • Complete overhaul of the current host time(base)/BBT information delivered to plug-in types that matter: VST, VST3, CLAP and LV2.
  • Improved key-signature editing and display on Tempo Map / Markers (time-scale) management dialog.
  • Fixed plugin selection, when creating and switching initial track type, from audio to MIDI and vice-versa.
  • Fixed typos and updated some old MIDI GM2 Controller names.
  • Add current system user-name to the singleton/unique application instance identifier (when explicitly opted in at build configure time).

Qtractor 0.9.27 - An Early-Summer'22 Release

Hello there,

Qtractor 0.9.27 (early-summer'22) is out!


  • CLAP plug-in host support introduced. (EXPERIMENTAL)
  • Reviewed LV2 plug-in UI Touch feature/interface.
  • Auto-unlink MIDI clips when pasted/placed with Ctrl+click/Enter.
  • Fixed LV2 plug-ins UI X11 (native) initial size.
  • Fixed implicit deactivation when a plugin is removed from chain.
  • Fixed audio clip export, normalize and tempo-adjust when audio file number of channels is disparately greater than respective track's output bus count.
  • Fixed one killer lurking in MIDI Controller... modeless dialog instantiation.
  • Fixed non-effective automation curve node editing.
  • Track/Export Tracks... dialog ranges are not capped to current session-end anymore.
  • Fixed MIDI clip editor vertical-zooming when using the [Ctrl+]mouse-wheel.
  • Set auto-backward play-head location also when clicking on main track-view header/time-ruler and on thumb-view.
  • Fixed LV2 plug-in buffer-size initialization, esp. affecting the ZynReverb LV2 playback.
  • Export Tracks dialog last range selection is now remembered.
  • Fixed the out-of-process plugin scanner path resolution on some self-container(ized) formats eg. AppImage and possibly Flatpak.

Vee One Suite 0.9.26 - An End-of-Spring'22 Release


The Vee One Suite of old-school software instruments,

  • synthv1 as a polyphonic subtractive synthesizer;
  • samplv1 a polyphonic sampler synthesizer;
  • drumkv1 as yet another drum-kit sampler;
  • padthv1 a polyphonic additive synthesizer.

Are here and once again released for the (northern) End-of-Spring'22 season.


  • Corrected an incredible mistake introduced in the last year's Glide/portamento potential crash fix. (applies to all but drumkv1)
  • Added Qt::Svg module as required at build time.

Qtractor 0.9.26 - A Spring'22 Release batch #3

Wholly greetings, one third time and finally,

Qtractor 0.9.26 (spring'22) is released!


  • Main application icon is now presented in scalable format (SVG).
  • Have even more tolerance to JACK buffer-size changes, prompting for a complete session reload, only when exceeding the double of the previous/current size.
  • Added an additional status-bar label to show the session current buffer-size (in frames per period).
  • Migrated command line parsing to QCommandLineParser/Option (Qt >= 5.2)
  • Make last recorded clip current and suitable target for immediate loop recording takes switch or navigation.
  • Number of takes is now shown on clip titles and tooltips.
  • Fixed in-flight transport mode changes.
  • Fixed translations path to be relative to application runtime.


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.


Project page:


Git repos:

Wiki (severely outdated; help wanted, desperately!):


Qtractor is free, open-source Linux Audio software, distributed under the terms of the GNU General Public License (GPL) version 2 or later.

Keep the fun, make some noise, and if that fails, make some music!

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