Quite right about it being a tirolian version of the dulcimer.(I know cos I live there!) Here we call it a Scheidholz or Hexenscheidt and its basically dulcimer with three melody strings tuned in quints and up to 5 sympathetic strings which arent played but vibrate in much the same way as the strings on a sitar. It seems to have fallen a bit out of fashion in the tirolian folkmusic, but was once very widespread throughout middle-europe and known as the Trummscheidt in the middleages. Grüße, John.