@@salvatorecollura2692 The tuning -as in Baroque music in general - is a kind of meantone temperament, and the a'=415 Hz, a semitone below the standard established in the 20th century.
Phenomenal work, although - as much as I enjoy a false relation, I am not a fan of the G-flat against the G-natural at 3:11. I think the completely diatonic nature of the work as is found in other recordings ought to be preserved.
If for you a' is always 440 Hz - which it wasn't during Vivaldi's time - then yes, you hear it as C sharp (or D flat) minor. By the way, I don't think I have a single work from Vivaldi, Händel or Bach played with a'=440 Hz on my channel (since I only use recordings of Baroque music on period instruments.)
