This video demos the Starr Labs Microzone U-648 Generalized Keyboard – a large Array Matrix Hex keyboard MIDI controller.
Offering an array of 288 keys, the U-648 is designed so that musicians can create any variety of tonal systems, fingering systems, and divisions of the octave within the world of MIDI.
This works well with microtonal music where a large array is needed for each octave. The MicroZone allows the user to define multiple arrangements of notes, fingerings, tonal layouts, and tunings for whatever musical application needed.
Details are available at the Starr Labs site.