To answer the latter portion of the question "I wonder if there are different tunings in different regions," the nyatiti does not have a wide regional distribution. It was only limited to Siaya (in the Nyanza region along Lake Victoria), and within Siaya only the two areas of Alego and to a lesser extent Ugenya. While the players in Alega and Ugenya are ...
It depends on the player, though the tunings are mostly based on major or minor pentatonics. I tune (from top to bottem) B A G E E D B A, though some tune it up or down depending on their singing range and many will opt for a major tuning using G# instead of G.
The middle E and E are an octave apart from one another, with the top E being lower.
Some of ...
The price will vary based on who is trying to sell it to you and the age and condition of the instrument. Unfortunately, there is just no standard price.
They are hard to get. If you have connections and can do some travelling you can get one for $30. If you want one shipped to you from Nairobi you should expect to pay $300 or so.
Quality varies widely ...
3.) A 34 page pdf by William Ridenour
4.) For purchase, a book by Roderic Knight
5.) Several places to purchase African Music Scores
Also, Sona Jobarteh is a composer and Kora ...