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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.


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Wiki (severely outdated; help wanted, desperately!):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

Have fun, make some noise or else, make some music!

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yPhil's picture

That looks like a landmark release, thanks a LOT :) Hey is something wrong with the color / style theming system? It seems to behave weirdly, I can't seem to make any color / style setup permanent... Also sometimes, changing just the style changes nothing and doesn't trigger the usual "restart maybe needed" warning dialog, but on restart, style has indeed changed..?

Using: Qt 5.15.3

rncbc's picture

hi, now that you ask, the next dot release is just around the corner, and no, Qt5 is no longer here very well supported, mind you ;)

iow. as said on the late year, Qt6 is the new rule--make sure your distro is up to date


yPhil's picture

Wow, I didn't think it would be so hard to try to install QT6 on Ubuntu 22.

Thanks for your answer, I'm sure all my problems come from this. I thought the package (in the apt / rpm sense) would pull all the dependencies in the most desirable version, but then again said package has to exist and it seems, so far (I'm been on this since yesterday morning) that no such package (QT6 for Ubuntu 22) exists :(

I tried the Appimage version but same thing, QT5. I though my days of building QTractor from source (a pretty straightforward experience notheless) were over :/

If anyone here knows how to have QTractor (& friends) use QT6 on Ubuntu 22, please let us know.

EDIT - never mind, I remembered about your ppa (it is so well hidden I wonder how I even know about it) and used the jammy branch, and now everything is peachy :)

Aligato again, Sensei.

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