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Qtractor 0.6.6 - The Lazy Tachyon is out!

And finally, for the wrap of the pre-LAC2015@JGU-Mainz release party, no other than the crown jewel of the whole Qstuff bunch ;)

Qtractor 0.6.6 (lazy tachyon beta) is out!

Release highlights:

  • LV2 and VST plugins GUI position persistence (NEW)
  • MIDI clip editor record/overdub note rendering (FIX)
  • VST plugin recursive discovery/search path (NEW)
  • VST-shell sub-plugins support (FIX)
  • also some old and new lurking bugs squashed.

< href="">Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt4 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:



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


  • MIDI clip record/reopen to/from SMF format 0 has been fixed.
  • LV2 and VST plugins GUI editor widget position is preserved across hide/show cycles.
  • Added application description as's AppData.
  • Added a "Don't ask this again" prompt option to zip/archive extrated directory removal/replace warning messages.
  • MIDI clip editor (aka. piano-roll) gets lingering notes properly shown while on record/overdubbing.
  • Current highlighted client/port connections are now drawn with thicker connector lines.
  • Fixing segfaults due to QClipboard::mimeData() returning an invalid null pointer while on Qt5 and Weston.
  • Return of an old hack/fix for some native VST plugins with GUI editor, on whether to skip the explicit shared library unloading on close and thus avoid some mysterious crashes on session and/or application exit.
  • Force reset of plugin selection list when any of the plugin search paths change (in View/Options.../Plugins/Paths).
  • Recursive VST plugin search is now in effect for inventory and discovery on path sub-directories (VST only).
  • Non-dummy scannig for regular VST, non-shell plugins, were doomed to infinite-loop freezes on discovery, now fixed.

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Enjoy && keep the fun.

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