A circuit enabling spoken directions to be given from a studio control cubicle or television control room, or from a production panel to a studio, or other program source, for the purpose of directing a performance or rehearsal.
"A few years ago, my mother gave me some reel-to-reel tapes that her and my father exchanged back in 1967 while he was serving in Viet Nam as an officer in the Marine Corps. He died in 1972 when I was 8 years old. Neither my mother or I have a RtoR player so we weren't sure if the 30+ year old tapes were salvagable. I sent them into you and I ..."