I think they had Altenburg on during the Miller race, but other than those couple races it's been the regular guys. Greg, Brian and Calvin all do a very good job of walking through the paddock during official practice and qualifying days gathering info for the broadcast. I had a good chat with Greg prior to the Mosport race; very nice, informed guy. Tom, who does the live comentary at the venue, often has racers in the booth with him to provide some color and feedback on technical or driving issues. Tom can get a little too personal though when talking about the drivers. He has some close relationships with them though so if you don't understand that, it can come off a little biting.