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Developer(s) Rui Nuno Capela
Stable release 0.7.1 / 9 October 2015 (2015-10-09)
Written in C++ (Qt)
Operating system Linux
Available in English
Type Digital audio workstation
License GNU General Public License

Qtractor is a hard disk recorder and digital audio workstation application for Linux. Qtractor is written in C++ and is based on the Qt framework. Its author is Rui Nuno Capela, who is also responsible for the Qjackctl, Qsynth and Qsampler line of Linux audio software. Qtractor's intention is to provide digital audio workstation software simple enough for the average home user, and yet powerful enough for the professional user.

Qtractor is currently under rapid development, and Git versions are updated often with new features.

Released under the terms of the GNU General Public License, Qtractor is a free and open source software application.


  • Overview 1
  • Features 2
  • Compatibility 3
  • See also 4
  • References 5
  • External links 6


Qtractor is a non-destructive digital audio and MIDI multi-track composition sequencer and arranger software application. It does not affect, alter or modify the audio and/or MIDI files that are displayed as Clip Objects. Exceptions are files resulting from capture and recording operations or from explicit changes made through specialized Clip editing (e.g., MIDI Editor).

Currently Qtractor is simply the hobby project of one developer. Development was started on April 2005, initially as a Qt3 application. Since October 2006, it is officially a Qt4 application.

Qtractor is natively hardwired and exclusive to the JACK Audio Connection Kit infrastructure, and the ALSA sequencer for MIDI. Its current dependence on ALSA makes it a Linux-only application.


  • Supports all sample rates, only restricted by hardware.
  • Supports multiple audio file formats, both compressed and uncompressed, including older formats such as 8SVX and .iff.
  • Clip editing and automatic or manual Time Stretching abilities.
  • Supports most major audio and MIDI file formats and most Linux plugin technologies.
  • Clips may be easily edited by dragging the left or right edges for cropping, or even for timeshifting, by using the shift key modifier.
  • Qtractor may be used in an audio mastering environment. Its integration with JACK makes it possible to use mastering tools such as JAMin to process the audio data.
  • Qtractor has both an audio and MIDI metronome with user selectable audio samples.
  • Easily move and copy plugins (with params) among tracks.
  • Keyboard commands (hotkeys) are entirely customizable.
  • Audition audio files within the Files dialog.
  • Built-in Qjackctl Connections dialog.
  • Supports LADSPA, DSSI (this includes DSSI-VST wrapper), native Linux VST and LV2 plugins.


Qtractor relies on plugins to enable many features from audio effects processing to dynamic control. Qtractor supports the LADSPA plugin architecture, as well as DSSI, native Linux VST and LV2. Support for Steinberg's VST plugin standard with Wine is available using the DSSI-VST wrapper. Qtractor "remembers" all these connections, and re-establishes them when a session project is reloaded.

See also


Qtractor home page

External links

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