MRCC 880 issue with patch data sysex not transmitting from PC to synth DIN input

[oldgearguy]

I have an 880. I'll try to get some sysex testing in tonight or tomorrow evening.

Just so I can be clear -- what is the official Conductive Labs status for system exclusive transmission on both the 880 and the MRCC?

DIN <--> DIN, (both)
DIN <--> PC port. (both)
DIN <--> USB (MRCC)
USB <--> PC port (MRCC)