Qtractor 0.7.4 recently released, is a free, open-source Audio/MIDI multi-track sequencer application written in C++ with the Qt4 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 0.7.4 Changelog Eye-candy warning: muted/non-soloed tracks are now shaded over the main thumb-view.
Audacity 2.1.1 recently released, is a free, open source, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. A notable improvement is the new “Crossfade Tracks” effect which can now be used for crossfading two tracks. This replaces Cross Fade In and Cross Fade Out. Audacity 2.1.1 changelog Improvements Effects Built-in effects now support presets. New Limiter effect replaces Hard Limiter effect.