Hi Dan, glad to know I’m not the only one with more than 2 units of this fine Pre(s)! I love them so much that I’ve been working on this solution for quite sometime, on paper, and finally got the chance to actually do the test this year.
The set-up using the P16-I(s), is elegant and soo flexible especially when all your MR(s) are all patched HalfNormaled! The flexibility in hardware routing along with and complimenting CB’s Direct Routing software routing is a beatiful marriage in routing capabilities with the amount of I/O(s) these units offer. Looking back at all my previous posts on the topic, I just found out I started to look into this hardware marriage (MR816 + P16) back in June 2016. From this point on, with this foundation in-place (ease and flexibility in routing and monitoring), everything else that needs to be connected and monitored to this system/setup should be a breeze.
When it does come together and works as designed, it’s another accomplishment you can be proud of!
Thanks for sounding off and sharing in your setup, I know others would be interested on our use of the P16 + MR816 ! 
. Cheers! - Ron
Here’s a snap of the current installation
