Yes, sidechaining was available looooong time ago in Cubase ...
I was doing this with a "Quaddro-Track" and plugins such as the Voxengo Crunchessor
As another member mentioned too, I absolutely don't like the look of the new mixer. Personally!
I was happy the moment the mixer turned into a "pro-like" look, now this..?!? Come on! That's playmobil, sorry
Was thinking about to jump on another DAW the last months, now this makes my decision easy. I WAS a huge CB fan for years!