> But that particular musical direction is "con dolcessa," no?

No, "con dolcezza" (pron. [kondol'tSets:a]).

"Con dolcessa" (or actually "côn dôlcèssa", pron. [ku~dultSEsa]) is how it
would be spelled in my own dialect, Milanese.

But I really coudn't imagine Vivaldi writing down musical directions as my
grocer would. :-)

--
Marco