dred2009

I’m trying to sync my daw to Sibelius, but not in the traditional way. I saw a composer using the daw and the notation software at the same time once. When he wrote something in the piano roll, it was inserted into the sheet music of Sibelius at the same time, and it worked the other way around, thus he could write on Sibelius and then the midi would be generated in the piano roll. How do I do that?