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 Qtractor by rncbc is a Virtual Instrument Audio Plugin and an Audio Plugin Host. It functions as a DSSI Plugin and a LADSPA Plugin. It can host VST Plugins, DSSI Plugins, LADSPA Plugins and LV2 Plugins.
Product Qtractor
Developer rncbc
Price (MSRP) N / A
Type / Tags
Plug-in, App & Soundware Format(s)
Can Host
Can Host
UtilityStand-alone utility / application
Operating System Availability
Download Released
 0.8.5    Download Released
Supported Sample Formats (loads or saves) include
Miscellaneous Information
Copy ProtectionNone

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.

Website: http://qtractor.org, http://qtractor.sourceforge.net

Project page: http://sourceforge.net/projects/qtractor

Weblog: http://www.rncbc.org

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


  • Multi-track audio and MIDI sequencing and recording.
  • Developed on the Qt C++ application and UI framework.
  • Uses JACK for audio and ALSA sequencer for MIDI as multimedia infrastructures.
  • Traditional multi-track tape recorder control paradigm.
  • Audio file formats support: OGG (via libvorbis), MP3 (via libmad, playback only), WAV, FLAC, AIFF and many, many more (via libsndfile).
  • Standard MIDI files support (format 0 and 1).
  • Non-destructive, non-linear editing.
  • Unlimited number of tracks per session/project.
  • Unlimited number of overlapping clips per track.
  • XML encoded session/project description files (SDI).
  • Point-and-click, multi-select, drag-and-drop interaction (drag, move, drop, cut, copy, paste, paste-repeat, delete, split, merge).
  • Unlimited undo/redo.
  • Built-in mixer and monitor controls.
  • Built-in connection patchbay control and persistence (a-la QjackCtl).
  • LADSPA, DSSI, native VST and LV2 plug-ins support.
  • Unlimited number of plug-ins per track or bus.
  • Plug-in presets, programs and chunk/configurations support, including native VST FXB/FXP file support.
  • Unlimited audio/MIDI effect send/return inserts per track or bus.
  • Loop-recording/takes.
  • Audio/MIDI clip fade-in/out, cross-fade (linear, quadratic, cubic).
  • Audio/MIDI clip gain/volume, normalize, export.
  • Audio/MIDI track and plugin parameter automation (dynamic curves, sample&hold, linear and spline modes).
  • Audio clip time-stretching (WSOLA-like or via librubberband), pitch-shifting (via librubberband) and seamless sample-rate conversion (via libsamplerate).
  • Audio/MIDI track export (mix-down, render, merge, freeze).
  • Audio/MIDI metronome bar/beat clicks.
  • Unlimited tempo/time-signature map.
  • MIDI clip editor (matrix/piano roll).
  • MIDI instrument definitions (a-la Cakewalk (tm));
    SoundFont (*.sf2) and MIDI Names XML (*.midnam) files also supported.
  • MIDI controller mapping/learn/assignment (mixer and plug-in parameters).
  • MIDI system exclusive (SysEx) setups.
  • JACK transport sync master/slave.
  • JACK session support.
  • NSM (Non Session Management) support.
  • MMC control surface enabled.
  • MIDI Clock, Song Position Pointer (SPP) support.
  • Configurable PC-keyboard and MIDI controller shortcuts.
User Rated

Review Qtractor Now!

Discussion: Active


20 August 2012 at 10:24amrncbc

holy thanks for the kind review Dan :)


25 August 2012 at 8:18pmdanboid

You're very welcome Rui!

Hope you've had a good holiday - if you're back now that is?

I was pleasantly surprised to see qtractor coming in at #1 in the Ranks and Ratings charts for free hosts in the last 7 days when I just looked now which is also how I just spotted your comment!

26 August 2012 at 10:39amrncbc

even more thankful to you Dan

your review rating 10 might have something to do with it, i suppose :)


25 August 2012 at 9:40pmglokraw

Realizing that a 10 rating is a friendly, but fictional and honorary perfection, qtractor is a fine achievement, and getting lots of improvements (the author has also released new instruments as well!). Linux as a DAW is very enjoyable, and easily acquired.

Studio 1337, AVLinux, KX studio add-ons, Remix-OS, Ubuntu Studio, Fedora CCRMA,

and quite a few others, have taken the configuration learning curve to new minimums,

and windows plugins are very usable, qtractor output can be easily summed with reaper,

festige, or dssi-vst output.

Those not subdued by piles of cash, might well get excellent performance using last-years computer,

in a fast RT linux, and discover some fine new software along the way. Yoshimi, rakarrack, and hydrogen,

and linux sampler, are getting updates, and make a solid core for composing using keys and guitars.

Burn a linux .iso to cd/DVD, or use unetbootin to easily install one on a usbstick. Reboot using early-boot menu

to avoid starting up your hard-disk windows gear.

Low floor, high ceiling!

26 August 2012 at 10:49amrncbc

@glokraw thanks

most comments one reads in the interwebs about linux audio & music have been superficially negative, more over when comparing to the big non-free, closed-source, proprietary systems.

in that regard, yours is positively awesome and brave ;)

thanks again

11 April 2015 at 7:43pmkobraaji

the best, thanks for this great sequencer.

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Average user rating of 10.00 from 1 review

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