Thanks for your interest Matt - I don't understand the MAC terminology in the error message either. I've been using ASIO for about 9 months after WAS issues using SONAR/Cakewalk for recording and editing with a Scarlett interface.

Actually, my most critical use for BIAB as a guitarist is real-time backing tracks for restaurant-type gigs. The mostly "standards" tracks I've built for these gigs are predominately Real-Tracks so I don't care about latency. I really love BIAB for this live application as I can change speed or key or feel at a moment's notice to keep things fresh.

I hate having to deal with a computer issue while loading in and setting up so I'm thinking a lowest risk approach is simply go MME for BIAB. Am I missing anything?