Hey, I didn't know there was an 8616! I used to have an 8816 a few years ago. John Wendt (Panasonic analog guru/curmudgeon) went over it for me, and a friend of mine designed a mod for me to give it a solo level control.
Good sounding board. I think I paid $1500 for it, used it for a good 8 years, and then got $350 for it.