Here are a few Youtube clips of headset audio from various local newscasts. Some of them are better than others, and you’ll probably want to watch them first to skip ahead to the pertinent sections.
YouTube – KTVY – Newscast Headset Audio
YouTube – FoxCharlotte HD/New Set Launch (Director Track)
YT – Breaking News Director’s Track
YT – Director’s Track Winter Storm
Here is another director’s audio clip from a 1979 episode of Match Game.
http://www.youtube.com/watch?v=DduZnMEtwSE&feature=related
Here’s a director’s track in which you can clearly hear all of the shots being called as well as the director giving some direction to the camera operators: http://www.youtube.com/watch?v=tlqcBquLDdc .