Thanks Kevin!
Yes. Ease and performance of MU or Consisting in RailPro made the initial decision for me.
I'm still not very happy with steam sound chuff timing. Even with the input wire being used, the signal on the input only seems to be a suggestion of speed, not an absolute go/no-go for the chuff sound. I'm willing to live with that to avail myself of all the other features, but i sure wish Tim could get it to work like all of the sound only boards.
I do a lot of switching ops and having an absolute chuff sound tells me if a loco is moving without looking at it. Current implementation will continue to chuff when stopped and sometimes move without any chuff at all.