You are here

Qtractor 0.7.7 - The Haziest Photon is out!

Hi everybody,

On the wrap of the late Berlin (April 8-10), where this Yet Same Old Qstuff* (continued) workshop babbling of yours truly (slides, videos) was taken place.

There's really one (big) thing to keep in mind, as always: Qtractor is not, never was, meant to be a do-it-all monolith DAW. Quite frankly it isn't a pure modular model either. Maybe we can agree on calling it a hybrid perhaps? And still, all this time, it has been just truthful to its original mission statement--modulo some Qt major version numbers--nb. it started on Qt3 (2005-2007), then Qt4 (2008-2014), it is now Qt5, full throttle.


It must have been like start saying uh. this is probably the best dot or, if you rather call it that way, beta release of them all!

Qtractor 0.7.7 (haziest photon) is out!

Everybody is here compelled to update.

Leave no excuses behind.

As for the mission statement coined above, you know it's the same as ever was (and it now goes to eleven years in the making):

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:


  • LV2 UI Touch feature/interface support added.
  • MIDI aware plug-ins are now void from multiple or parallel instantiation.
  • MIDI tracks and buses plug-in chains now honor the number of effective audio channels from the assigned audio output bus; dedicated audio output ports will keep default to the stereo two channels.
  • Plug-in rescan option has been added to plug-ins selection dialog (yet another suggestion by Frank Neumann, thanks).
  • Dropped the --enable-qt5 from configure as found redundant given that's the build default anyway (suggestion by Guido Scholz, thanks).
  • Immediate visual sync has been added to main and MIDI clip editor thumb-views (a request by Frank Neumann, thanks).
  • Fixed an old MIDI clip editor contents disappearing bug, which manifested when drawing free-hand (ie. Edit/Select Mode/Edit Draw is on) over and behind its start/beginning position (while in the lower view pane).

Wiki (on going, 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.

Donate to


Enjoy && Have fun.


Hi Rui,

Following on from our conversations the other day, it looks like this bug is present in this version again. I'm getting the same "un-loading sf2" issue with fluidsynth-dssi that you fixed.

Just in case, I checked with LV2 plugins on the same tracks, in several projects, and they were fine, so there's no problem with either LV2 or the routing etc. on those tracks. As I say, it looks like the same bug as last time.

rncbc's picture

i'm failing to reproduce this one again (fluidsynth-dssi failing to load its previously configured sf2's)

will keep trying though.


Ah, that's a shame.

I encountered this problem last night and it happened 100% on 3 different projects with various sf2s, but after rolling back to 0.7.6 to double-check that everything was fine (it was) and re-installing 0.7.7 again, today I'm getting something different. I haven't seen the sf2 un-loaded yet, but often the audio won't play; at other times, it plays fine even after saving. As per the previous posts, the mixer responds and LV2 works fine on the same track.

I had the bug consistently on a clean session last night, but can't reproduce it on one today. I'll upload a qtz of a session I've had problems with on another thread. Not sure if it'll be of any help, but we'll see.

I am an opensource Software developper and very interested about getting invovlved in this great project
May i help? Coding ? wiki ? etc....
Feel free to contact me @

rncbc's picture

any help and especially to the wiki is always welcome ;)


yPhil's picture

Hi all!

I'm wondering why (oh, why?) when I shift-click (in an empty part of a track) to move the playhead, said track becomes selected? I can't see any justification for this behaviour, and it can be very problematic when using auto-monitor..?

PS - great release, as usual :)
PPS - Everyone, check out my Qtractor videos!

rncbc's picture

if you want to avoid that behavior -- clicking anywhere on the track view always sets the current track -- try to only shift-click on the time ruler to move the play-head. while on that you can also drag and move the play-head cursor any time, anywhere.


Add new comment