The BL7000 essentially sets itself up. If you change your system, go into the Panel/Setup/Systems/Components section as detailed above and remove all the components. Save this and then going into exactly the same place, add those components you have. The Beolink 7000 sends out a test signal and if it gets a response, the component is stored as 2 way, and if it gets no response, one way. Clever these Danes!