I don’t see why you need a midi thru box. I didn’t have one. Glad you found a setup that works. I’m 100% sure I didn’t do it that way, the BCR for me was always going IN to the OT.

I just went back to check the BCR and it was in S4 mode (I looped it back to get feedback from the OT). (I also checked the modes and I think you could run in 1 or 3, but not 2)

Guess all is well so that’s the end of that!