There's really one (big) thing to keep in mind, as always: Qtractor is not, never was, meant to be a do-it-all monolith DAW. Quite frankly it isn't a pure modular model either. Maybe we can agree on calling it a hybrid perhaps? And still, all this time, it has been just truthful to its original mission statement--modulo some Qt major version numbers--nb. it started on Qt3 (2005-2007), then Qt4 (2008-2014), it is now Qt5, full throttle.
It must have been like start saying uh. this is probably the best dot or, if you rather call it that way, beta release of them all!
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.
The so called Vee One Suite aka. the gang of three of old-school software instruments, respectively synthv1, as a polyphonic subtractive synthesizer, samplv1, a polyphonic sampler synthesizer and drumkv1 as one drum-kit sampler, are released yet again in their ninth official beta second iteration (bis).
Still available in dual form:
a pure stand-alone JACK client with JACK-session, NSM (Non Session management) and both JACK MIDI and ALSA MIDI input support;