I think you and Silvertones are both right about that, but I also think that it's possible for RB to somehow override BiaB's default C chord. Tech Support just has to find a way to implement it.

Also, this discussion is essentially over until Tech Support does come through with a fix, so your post and your suggestion to "'get r done' however it works best" are fine. In the meantime, I'm hoping that the upcoming release of RB 2019 Version 4 will include a fix for this issue.
Tom Levan (pronounced La-VAN)
BiaB 2021 Win UltraPAK Build 833, Xtra Style PAKs 1-11, RB 2021, Windows 10 Pro 64-bit, Intel Q9650 3 GHz, 8 GB RAM, 500 GB SSD & 2 TB HDD, Tracktion 6 & 7 (freebies), Cakewalk, Audacity, MuseScore 2.1 & 3.4, Synthesizer V