Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt4 framework . Target platform is Linux, where the a 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 GNU General Public License (GPL) .
Thanks to Pedro Lopez-Cabanillas and Guido Scholz, this Qsynth release is now a reality. Main new features are the new rotating knob style options, first full translations, German and Spanish and last but not least, there's this WindowsTM all-in-one package available (includes FluidSynth port) for your (sick:) pleasure only. Please read below the brilliant notes from Pedro about this breakthrouth release. Yes, before's too late:
Release highlights are mainly about final JACK-MIDI support for the "evil" Patchbay, new Messages file logging and the most intriguing application window instance uniqueness which will make X11 desktop life easier for everyone (ie. no more duplicates as JACK server gets auto-started as candy bonus:)
After another quarantine period, I am pleased to announce (yet) another maintenance release of my flag-ship toy, Qtractor, an Audio/MIDI multi-track "bedroom" sequencer for the techno-boy and girl. Probably, the major feature highlight for this release, is the new optional support for in-place audio clip pitch-shifting through Chris Cannam's Rubber Band audio time stretcher. This one alone just closes the gap on the techno-boy/girl bedroom-studio prospects, so let's move along, nothing really new to see here :) However, given there were many inner changes in the audio rendering engine everything might just sound a lot less glitchy than previous releases. Therefore, everybody is welcome to upgrade. And please, don't be shy ;)
Season greetings. As (almost) everybody knows already, or ought to, Qtractor is an Audio/MIDI multi-track sequencer application, written in C++ on the Qt4 framework and Linux is about its native platform. Thus, JACK and ALSA are the main infrastructures that fit to purpose, respectively for audio and MIDI.
Also a known fact is that this is nothing more than my pet, hobby, spare-time-burner, whatever project, but... it's actually my own dogfood where digital music making and (re)creation matters. Yep. I still have this sublime hope to make it evolve as a fairly featured Desktop Audio/MIDI Workstation, one special and dedicated to the personal homestudio. As joked many times before, it's perfectly tagged for the techno-boy bedroom home-studio, but techno-girls can also apply ;). You tell me.