Craig Duncan in his The Craig Duncan Master Fiddle Solo Collection, ©1999 Mel Bay, shows a "standard" tuning for this piece - low string to high, A E A C#. This likely is the same as used by Kenny Baker, since it's a "standard showoff piece."

As notated by Duncan every note in the piece is played as "double stops." There are a few places noted as "Left Hand Pizzicato" which may be helpful if you're trying to figure out how they get the "effects."

John