Brian,
Quite right. I just love that sound. You almost might think that the zither is the forerunner of the modern keyboard, in that the way it is set up you have two distinct sections: an area where you can play the chords (ie. the left of the 'split'); and a completely different set-up enabling you to play the melody (ie. the right of the split).
It has taken me a couple of years to get this sound (or similar) out of the AR, and that extract was just a small part of my attempt at playing this piece .. which I will put up in the Performance Board so you can hear all of it.
In the meantime, here is a short extract on YouTube of the zither being played by the composer, who also recorded it on the zither for the film. Clicking on this LINK will, of course, give you all the answers to the questions I asked in
Name That Tune No: 4.
https://www.youtube.com/watch?v=PatFHj6WBbwHugh