I'm wondering how many of the early publications for a 'theorbo' (various
spellings) or chitarrone were actually for large 10c bass lutes with
re-entrant tunings?
I wonder about this too! As far as I know, Kapsberger's Libro primo for
chitarrone is for a 10-course instrument.
You can find
Banchieri in his Conclusioni nel suono dell'organo (Bologna 1609), p. 59,
gives a G tuning for the chitarrone, with the
reentrant tuning for the first string only.
From my homepage (under 'docs tab') you can download a pdf copy of my
dissertation about the chitarrone and the continuo in