I don’t believe Cubase can be tuned to anything but 440 Hz, but there are some VSTi’s whose “concert pitch” can be changed. Fortunately, one of these is Kontakt. Once in a while, I do some baroque mockups, and with Kontakt it’s super-easy to do 415 Hz or any other tuning (click on MASTER at the top. You can go from 392 Hz to 493.88 Hz.)