New instruments that I have no clue about!
Site QUESTIONS ? How do I...?
It appears in the first photo that there are four strings over the fret board which would be tuned to any standard dulcimer tuning where the melody string is doubled, DAdd or DAAA. I can't see the strings that off the fret board very well, but they might be drones perhaps a bass version of the melody string an octave or two lower and the other a the same of the middle string. The second photo shows a doubled melody string which four equally distant placed drone strings. Again, you could use a standard dulcimer tuning with bass octaves on the other two strings if they are thick wound strings.
This is just my guess and others may provide better information.
Ken
"The dulcimer sings a sweet song."