Hi Don, there is more than one tuning possible- you'll find lots of info and discussions of tunings and fingerings for 4 equidistant string setup in our Group of the same name:
https://fotmd.com/heidi-muller/group/27/four-equidistant-strings
Remember you'll need to click the "join group" button in order to see the discussion replies and comment wall of a group. (You can always click the same button to easily UNjoin later.)
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