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Qtractor 0.9.35 - An End-of-Summer'23 Release batch #3

Hi, thrice again,

Qtractor 0.9.35 (end-of-summer'23) is out!


  • MIDI Step-input is now finally featured on the MIDI clip editor (aka. piano-roll), provided Clip/Record is on and playback is not rolling; current snap-to-beat applies; starts/resets to play-head; Edit/Insert/Step to advance a single step/rest.
  • Notes keyed in the MIDI clip editor's virtual piano keyboard may now be recorded, especially while "overdubbing".
  • The official VST3 plug-in SDK is now included in the source tree as Git submodules.
  • Fixed a rounding error on current BBT information passed to plugins and to JACK transport/timebase.
  • When on Track/Auto Deactivate mode, plugins now show a dull, dimmed lit, green (fake-)LED when in auto-deactivated state.
  • Attempt to actually (de)activate plugins once on (de)instantiation.
  • Preppings to next development cycle (Qt >= 6.6)


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Wiki (severely outdated; help wanted!):


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

Keep having fun!

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