The interface uses a combination of controls. Mode independent controls
retain essentially the same function throughout all modes and features
and mode dependent controls vary based on the active mode or feature. The
arrangement of the mode controls, the soft controls and the display is
designed to facilitate the user's interaction with the system. The system
provides some redundant controls so that the user can select the control
that is most convenient or intuitive for that user. The interface
supports a multizone system having a primary zone and one or more
secondary zones. Information for the active mode of the active zone is
provided via the display.