[Harp-L] Anyone figured out Ketch Secor's playing?

["Matthew Bullis" <matthewbullis@xxxxxxxxxx>]

Hello, back on the list for maybe the third time in several years. I'm 
wondering if anyone has tips on Ketch Secor's playing? He's the fiddler and 
singer for The Old Crow Medicine Show. In this video, he's switching between 
two harps, though I can't figure out the difference, since it just sounds 
like cross harp on a D.
http://www.youtube.com/watch?v=mU4_eJqDO-s
The song starts about two minutes in or so. I don't know if he ever fiddles 
during the same song as a harp solo, but I wonder if the sounds he gets can 
still be achieved with a neck rack?
Thanks a lot.
Matthew