David Kastrup <[email protected]> writes: > There are other uniform chromatic systems, like the related 2-row based > Jankó keyboard pianos, or the respective 6+6 or Bayreuther system for > accordions.
It's "Beyreuther system", sorry for the typo (it's named after Johannes Beyreuther rather than the town Bayreuth). > They've not made it into mainstream. -- David Kastrup
