You are here

Qtractor 0.6.7 - The Lepton Acid beta release!

It's alive!

Qtractor 0.6.7 (lepton acid beta) is out!

Release highlights:

  • MIDI instrument rendering on audio export (NEW)
  • MIDI clip editor view/event criteria persistence (NEW)
  • MIDI clip editor resilience on record/overdub (FIX)
  • Generic plugin form position persistence (NEW)
  • JACK Transport/Timebase master option (NEW)
  • and yet more tiny lurking critters swatted ;)

Well, the major highlight to this release is in fact this brand new and way long overdue feature, seamlessly integrated to the faithful and regular audio track export function: MIDI track instrument plug-in rendering and mix-down (aka. freeze) is now real, as long their audio output goes onto selected buses, aka. stems, mix-groups, whatever a mix/mastering head would name it! nb. on the (very exquisite) Qtractor arch-model parlance, those are just called "audio output buses" and that ain't gonna change, any time soon, so stop it! A word of caution must be told by now: dedicated (JACK) audio output ports are off-the-grid, so sorry.

Maybe this silently makes a notch towards the DAW epitome, though Qtractor still claims to be just a plain and honest sequencer--with yet another DAW-like feature addition--the same as it ever was.

Nuff said.

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:



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


  • MIDI clip editor (aka. piano-roll) position, size, and view/event type criteria are now persistent, across session and user preferences application state.
  • Generic plugin form widget position is now also preserved across open/save session cycles.
  • MIDI clip editor resilience is about to get an improvement, fe. it doesn't close on stopping record/overdub anymore.
  • Introducing (JACK) Timebase master setting as an option to Transport mode (cf. View/Options.../General/Transport/Timebase).
  • LV2 plug-in MIDI/Event support now slanted for deprecation.
  • Spanish (es) translation added, by David Reyes Pucheta.
  • It's live: audio track export (cf. Track/Export Tracks/Audio...) has been deeply refactored to finally include MIDI track/instrument plugins rendering (aka. freeze) on selected audio output buses on mix-down. (EXPERIMENTAL)
  • MIDI file player now does (N)RPN 14-bit controller events.
  • Track properties dialog output bus switch fix/optimization; also fixed multiple DSSI instance reference count on close.
  • Fixed for some strict tests for Qt4 vs. Qt5 configure builds.
  • German (de) translation update (by Guido Scholz, thanks).

Donate to

Enjoy && keep the fun.


thanks its help me

Daniel Gomes

yPhil's picture

Hi Rui Nuno, why does the "backward" and "forward" shortcuts I defined only seem to work in the timeline and not in the clip editor, forcing me to use the mouse? Is there something that I missed?

rncbc's picture

the MIDI clip editor has its own shortcuts configuration settings

maybe you can try to redefine the same on there (menu Help/Shortcuts...) ?


ps. if you're running from current git master head (v0.6.7.9+), take care that shortcuts configuration is going through significant changes, mainly to adopt MIDI controllers to the picture in addition to PC-keyboard shortcuts.

yPhil's picture

the MIDI clip editor has its own shortcuts configuration settings

Duly noted, thanks!

Add new comment