Double or Single-Handed

The Kelstone is one of the few instruments that you can play
with just one hand and say something that is relevant.
While it won’t make sense to do that on a piano, here it does as
you can express a lot because of the control of the envelope of the notes.
And also because that hand can overlap almost 4 octaves (harmony).

A short sample of how you could play Kelstone with just one hand.
The accompaniment is done double-handed in a pianistic way (one hand bassline and the other chords).
You’ll probably recognise ‘I’d rather go blind’ by Etta James.

For a guitarplayer it is quite easy to play this way with his right hand,
although his lefthand has practised for years and is very skilled.
This is so because for the human brain
the right hand in front of the player is the same as 
the left hand upside down, around a neck of a stringed instrument:
First and strong finger to the left and moving up in tone to the right towards the little finger.
This is why guitar players will easily improvise with their right hand on a piano.

The Kelstone can be easily mirrored so this is possible for the left hand as well.

Being the bassplayer in a band with only one hand becomes an option.

This feature opens opportunities for people who have only that one hand to their disposal, be it as a bassplayer, accompanist or soloist.