Try doing a search on Ukelin - E not U - and you will find Bob Bozas site
or try www.geocities.com/~ukelin/
There are no drone strings. The strings under the chromatic scale strings are chords. The chromatic strings start with C. it is played like a psaltery. We have several which my wife plays. Bob's site alos gives a discography, including ours, on which the Ukelin is played.