Changing Port Assignments
You can change the port assignment of busses in the VST Connection window.
To change a port assignment, click in the Device Port column of a bus and select a new port.
To assign different ports to the selected busses, open the Device Port pop-up menu for the first selected entry, press Shift, and select a device port.
All subsequent busses are automatically connected to the next available port.
To assign the same port to all selected busses, open the Device Port pop-up menu for the first selected entry, press Shift-Alt, and select a device port.