Why the Kelstone is not a guitar or a piano
As stated in the introduction the piano and the guitar are in the first place chord instruments and secondarily (thanks to electric technology) ‘one-note-expressive’ instruments.
The Kelstone on the other hand is first of all a ‘one-note-expressive’ and only secondarily a chord instrument regardless of electric technology.
This is counter-intuitive when you see an image of the instrument.
Why is the Kelstone not a Lap Steel Guitar:
The Lap Steel Guitar has no frets and is therefore not a ‘fretted instrument’. Or to say it like Bach would: it is not a ‘Wohltemperierte Klavier’:
A DO # is not a REb on the lapsteelguitar. On guitar, piano, Kelstone, a DO # is a REb.
And there is no hammering on the strings.
A very specific technique (sliding) is used in which a smooth piece of metal or a Bottleneck slides over the strings.
Why is the Kelstone not a Chapman Stick or traditional tapping instrument:
The Chapman Stick builds on the hammer technique (two-hand tapping) of the guitar and
turned it into tapping with two hands (which is something completely different).
The Kelstone builds on the tradition of percussion and key instruments:
In harmony with gravity, stable on a stand (separate from the player who can move freely),
clearly visible and an expression action away from the player towards the audience.
And visibility and portability are organise fundamentally different.
The Stick is basically a chord instrument, and not really a one-note-expressive instrument.
Why the Kelstone is not a Dulcimer (Bumblebee, Elder) or a Zither
On a Dulcimer one does not hammer on the strings.
The basic technique here is to pick/pluck the string (fingerpicking and strumming).
A Dulcimer is basically a guitar that lies in front of you.
The Kelstone is rather a piano-keyboard with a two-dimensional interface.
Of course the Kelstone is not a Cimbalom (played with mallets) even though it is very interesting to hit the notes with a mallet on the Kelstone.
Once hit, one still has a very nice control over the vibration of the note with the left hand:
Kelstone with a mallet