I've got three  traditional Thai musical instruments from my partner who's been to Thai to make a hitchhike travel last week. And have fallen in love with one of them, Soh, just like erhu, a Chinese fiddle with two-strings and a bow. It produces violin-kind sounds. Have no idea how to tune or  play that. So I tuned it in G and D like violin. Its bow is not independent  from the instrument, it is attached in-between the two strings.

Very difficult to make or keep its sound stable and nice. Interesting that it procuces sounds like human vioces in various ways.

I play it from morning till evening several times a day, seeking for better and stable sounds. Roger, a grey parrot, now imitates its sounds very well.