The Studio "SLAVE" Auxiliary Relay Pack is a microprocessor based switching and control interface for various switching functions required in most broadcast studios and control rooms, where multiple and various isolated outputs are required to operate from one or more control inputs. Input and output connectors are Eurostyle pluggable types. Some outputs have user selectable provisions for release delay times from instantaneous to one second. Selection may be made to restrict the release delay to the Solid State Relay output driver voltages exclusively. LED power and activation indication is provided as well as a "test" button for activation of the unit locally.