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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.

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 an 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, freeze)
Unlimited undo/redo.
Built-in mixer and monitor controls.
Built-in connection patchbay control and persistence (a-la QjackCtl).
LADSPA, DSSI, native VSTi and LV2 plug-in 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.
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).
Audio/MIDI metronome bar/beat clicks.
Unlimited tempo/time-signature map.
Unlimited location/bar markers.
MIDI clip editor (matrix/piano roll).
MIDI instrument definitions (a-la Cakewalk(tm) (*.ins));
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.

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