Nopia - a Music Theory based keyboard tool prototype - notice the two separate one octave keyboards, one made of lighted round buttons for setting the scale, and the more conventional one, which plays chords based on the notes you play, the scale you’re in, and the other settings. There is also a looper and provisions for bass and rhythm.
That video is a year old now, this teaser from seven months ago says they’re still working in it:
