Yes, i have the CS18ai, i'm thinking about the upgrade from studio one 3.5 to the 4, but beacause it is impossible to use my cs18ai with studio one 4 i can't !
Really waiting for a total compatibility between studio one 4 and my cs18ai, like it is ine studio one 3.5 !!!
Please , at presonus, don't forget cs18ai users !!!