I used to direct live TV shows on community access TV. After a while I became fairly good and could do everything in the control room that was required for the show. This included directing camera operators, selecting the on-line camera, monitoring and adjusting audio levels, and cueing up and playing tapes. Granted this was all to one purpose, but it was a variety of different tasks requiring different skills and certainly counts as multi-tasking. Professional studios would have at least one person assigned to each of those tasks plus one to oversee the whole thing.
