What a great post! The Santur is a quadruple strung instrument with two set of string types - steel and copper. There is a great deal of tension in the instrument to get that ringing tone and as JRJ mentioned, it is very challenging to keep in tune. Similar to a Sitar, frets or string bridges, can be slightly moved altering the tuning to accommodate more western 12 tone tuning, but that is part of the charm and character of the instrument.
I have had the pleasure of playing with Navid Ardakani in the past who is a fine Santur player. We performed a Bb meditation and a version of Mercy Street at the last Free Hands Academy. Mercy was a nice choice as it stays in C#minor and it's relative major E and the Santur is in a fixed tuning. Navid has a second Santur that is in Fmajor.
Here is an excerpt from an evening of music we shared just this last year
[youtube]http://www.youtube.com/watch?v=NHUlIDIvsgs[/youtube]
Happy Sunday everyone