Qtractor

Version: 0.2.2 Qtractor is an Audio/MIDI multi-track sequencer application written in C++ around the Qt4 toolkit.

The initial target platform will be 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. Creating new clips from scratch and track record monitoring with audio effects applied are now finally possible.

JACK Audio Connection Kit support . . . . . . . .: yes
ALSA MIDI Sequencer support . . . . . . . . . . .: yes
General audio file support (libsndfile) . . . . .: yes
Ogg Vorbis audio file support (libvorbis) . . . .: yes
MPEG-1 Audio Layer 3 file support (libmad) . . . .: yes
Sample-rate conversion support (libsamplerate) . .: yes
Pitch-shifting support (librubberband) . . . . . .: yes
OSC service support (liblo) . . . . . . . . . . .: yes
IEEE 32bit float optimizations . . . . . . . . . .: yes
SSE optimization support (x86) . . . . . . . . . .: yes
LADSPA Plug-in support . . . . . . . . . . . . . .: yes
DSSI Plug-in support . . . . . . . . . . . . . . .: yes
VST Plug-in support . . . . . . . . . . . . . . .: yes

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, delete, split)
Unlimited undo/redo.
Built-in mixer and monitor controls.
Built-in connection patchbay control and persistence (a-la QjackCtl).
LADSPA, DSSI and native VSTi plug-in support.
Unlimited number of plug-ins per track or bus.
Plug-in presets, programs and chunk/configurations support.
Audio/MIDI clip fade-in/out (linear, quadratic, cubic).
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.
MIDI clip editor (piano roll).
MIDI instrument definitions (a-la Cakewalk(tm))
JACK transport sync master.
MMC control surface enabled.
Configurable keyboard shortcuts.