It looks more like a typewriter to most people. But it is indeed the latest keyboard based on Janko keyboard layout designed by Paul von Janko back in 1882. As a pianist, you will appreciate what this innovative, yet having centuries old history keyboard can help you achieve finger stretch over 11th notes!
Chromatone is a Japanese company that created the CT-312. Indicated in the name, it has 312 keys!! about 4 times the size of 88-keys piano. But don’t worry, it was stacked up nicely for you to stretch wider interval easily.
Figure 1: Janko keyboard layout.
Figure 2: Chromatone CT-312
Watch the CT-312 in action in this funky tune – Together by a Japanese artist ?????. This is a very nice tune!