Tonal Plexus Keyboard from H Pi Instruments
This is a microtonal keyboard, and hence gives you a much wider choice of harmonics, and chord sounds. No more settling for equal temperament tunings. The voice choice in the video above is atrocious but that shouldn’t be to hard to change.
The main website is here.
Overview of the keyboard layout.
As far as i can tell this is also not available – which seems to be a theme with alternate keyboards.