Qtractor

Qtractor is a Linux multi-track sequencer with Audio and Midi capabilities. It operates through the Jack Audio Connection Kit (JACK) and the Advanced Linux Sound Architecture (ALSA) for MIDI with the intentions to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio.

Qtractor is free and open-source software.

Download at:
http://qtractor.sourceforge.net/qtractor-index.html

Features

  • Multi-track audio and MIDI sequencing and recording.
  • Developed on pure Qt4 C++ application framework (no Qt3 nor KDE dependencies).
  • 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 VSTi and LV2 plug-in support.
  • Unlimited number of plug-ins per track or bus.
  • Plug-in presets, programs and chunk/configurations support.
  • Unlimited audio effect send/return inserts per track or bus.
  • Loop-recording/takes.
  • Audio/MIDI clip fade-in/out (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, merge).
  • Audio/MIDI metronome bar/beat clicks.
  • Unlimited tempo/time-signature map.
  • MIDI clip editor (matrix/piano roll).
  • MIDI instrument definitions (a-la Cakewalk(tm)).
  • MIDI controller mapping/learn/assignment (mixer and plug-in parameters).
  • MIDI system exclusive (SysEx) setups.
  • JACK transport sync master/slave.
  • JACK session support.
  • MMC control surface enabled.
  • MIDI Song Position cueing support.
  • Configurable keyboard shortcuts.

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