For sound examples and specs watch the Warwick Sound Examples: The Katana NT 4-String with Andy Irvine:
https://www.youtube.com/watch?v=x0_b3vf8mZ8
Music: Just The Two Of Us by Tetsuo Sakurai
For more information on the instrument go to:
https://goo.gl/xLTj2e
Watch the "Making Of" this instrument here:
https://www.youtube.com/watch?v=axHuvIcimtk
http://www.warwick.de
http://www.framus.de