Feature-support
Chordzy supports synthesizers in the web app and in the desktop/mobile apps. All MIDI keyboards should be supported, though more advanced features are not yet.
Split Ranges
In the future, you'll be able to assign multiple synths to the same keyboard by splitting the keyboard into sections. You'll also be able to adjust the octave and otherwise configure how each key-range works.
Aftertouch
While Chordzy understands aftertouch signals, it does not currently map them onto synthesizers.
MIDI2
MIDI2 support is still a ways off, but there's nothing preventing Chordzy from implementing it as soon as the team has time (contact us).