A few points from the (German) preface by F.J. Giesbert
'This edition reproduces the original musical text without any changes, merely as a full score instead of parts.'
Giesbert speculates that Rossi kept the range of the parts 'recorder-compatible' considering the popularity of that instrument (see the subtitle of the edition: "für vier Blockflöten ... oder Fideln" - 'for 4 recorders...').