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Qtractor 0.5.11 - The Lima Oscar release!

As falling leaves drift by the window, and without any further ado:

Qtractor 0.5.11 (lima oscar) is now released!

Soon we'll hear a new winter's song. This code-naming series, which started on a sunny summer day two years ago as TYOQA, is now converging to an end. It will be no surprise for some that today's release precedes the very last one on that series. So let's get those autumn leaves falling and grab them while they're crispy red and gold ;)

Release highlights:

  • Extended automation curve editing (NEW)
  • Extended clip selection (NEW)
  • LV2 UI resize feature support (NEW)
  • Aux-sends to audio buses (FIX)
  • MIDI editor overlapped event velocity/value (FIX)
  • Accidental export muting and/or freezing (FIX)



Project page:


Weblog (upstream support):


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


  • Adding a track now inserts it after the current one, if any; one can also drag and move a track below the last one in the track list (main view left pane).
  • Extended Edit/Select Mode/Automation: multi-selection mode, cut, copy, paste and delete of current track's automation curve nodes, now reached implementation ready status.
  • Another old silent bug bites the dust: changing track names were dropping any track gain/volume and panning automation curves when saving the session.
  • A primeval processing bug has been sorted out: aux-sends to audio output buses that just appear to be after the input bus where they're inserted were being left muted and silent (on a ticket follow-up by Holger Marzen, thanks).
  • Fixed a sure crash bug exposed when processing of aux-send plugins when inserted too early on audio input buses chain (after a ticket report by Holger Marzen, thanks).
  • Allow the build system to include an user specified CFLAGS (patch by Cristian Morales Vega, thanks).
  • Shift/Ctrl keyboard modifiers now set to extend current clip selection while in main track view's Edit/Select Mode/Range, Rectangle modes.
  • Main Edit/Select Mode/Automation icon retouched to look a bit more obvious and intuitive, hopefully ;)
  • Allow to change the velocities/values of the current selected events which have the exact same onset times and hide beyhond each other on the MIDI clip editor's pane below the main view piano-roll (ie. the one that represents MIDI event values as a bar chart).
  • Fixed some problematic playback/export muting and annoying cleanup freezing, due on audio tracks with too many clips eg. more than hundred clip splits (hopefully fixes an issue reported by Louigi Verona, thanks).
  • LV2 UI resize feature support/control added.
  • Fixed dedicated MIDI control and MIDI metronome port connection restore conflict (thanks to jhammen catch & patch:).
  • New user preference option added: reverse middle-button role to Shift/Ctrl keyboard state, in special regard to edit-head/tail vs. play-head positioning while on the main track and MIDI clip editor (aka. piano-roll) views.

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Enjoy && Have (lots of) fun.


yPhil's picture

> Another old silent bug bites the dust: changing track names were dropping any track gain/volume and panning automation curves when saving the session.

Ah ! I KNEW there was something like that happenning on track name change !

Thanks again, Rui.

Hello, i am Sylvain an experienced programmer with 12 years of experience in HTML, CSS, XML, JS
10 years with C#, PHP
And 1 year with C++
And a couple of months with QT Specific

I would be interessed to contribute on this project, im sure i can provide alot, so please add me on skype : wisahesa

Thank you.

Sylvain Martens

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