Janko 6 6 Layout

Currently the best explanation of the Janko key layout is at Noel Cragg's Page:
The Uniform Keyboard

Paul Vandervoort plays professionally on a Janko MIDI controller he build himself. He is in the process of developing his Janko MIDI controller into a commercial product. He self-produced a vinyl album in 1981-2. Check out the piano solo 2:00 into Infatuation!
http://daskin.com/PV_Album.html

A Japanese Company makes the Chromatone, a Janko Layout Synth:
http://www.chroma.jp/shop/

Yukihiro Kitazaki jamming on a Chromatone and a bass guitar simultaneously:
http://www.youtube.com/watch?v=Vd8AkgtN0hY
http://www.youtube.com/watch?v=mTRtCgaAEDE