> In any case it seems very unlikely that the problem as such can be fixed: the BCN's firmware would have to be reprogrammed.
> So the only "fix" seems to be your solution: use a different master keyboard.
One other solution I was considering before we got it working was to use a separate device to do the merging, like the MIDI Solutions Merger (http://www.midisolutions.com/prodmrg.htm). The built in merging was one of the reasons we got the BCN, but this would be easier (and cheaper) than switching keyboards.