[_ks3e]

Yes, but it's very uncommon on pianos these days. https://en.wikipedia.org/wiki/Jankó_keyboard

Most button accordions and modern electronic instruments (Linnstrument, Soundplane, Eigenharp) are have chromatic layouts... I wonder if you could hook up one of these devices up to a player piano without too much latency.

[gnud]

You'd lose the physical dimension of playing the keys.

For the accordion you adjust the force of the air, so you don't have to use different forces on the buttons. It's OK that you find them with only your fingertips.

That's less OK when the force hitting the key is directly transferred to the string making the sound. You need a dynamic range. It seems to me most of the people here are forgetting that.

Such a layout could probably be used on an organ. But I think keyboard size is less of a problem for organs?

[edhebert]

The Linnstrument captures the dynamic range of strike and release velocity, as well as pressure and aftertouch direction; translated to MPE (MIDI Polyphonic Expression).

As someone with relatively small hands for piano, I have been enjoying the wider range of intervals with one hand provided by the Linnstrument's layout.

[bluGill]

Organs are a smaller key size by tradition dating to before the piano. They are also less keys.