I just found an interview that Dave did with PRS sometime in this last year. Nothing really new, BUT is does have his signal flow:

• Barber TonePress Compressor
• Boss Tuner
• Ibanez Tube Screamer
• EH HOG
• Boss EQ
• Boss GigaDelay
• Digitech Whammy
• Boss RC-2 Loop Station
• (4)Line 6 DL4s

http://www.prsguitars.com/artists/mi...ear/index.html

He talks a little about his influences, and his his goldtop McCarty's history.

Unfortunately, we still do not know what the Boss RC-2 is used for...