Incompatibility with certain sound modules?

Hello! Sorry to be a bother, but I don't really know a good solution to this, or a better place to ask, for that matter.

I've been a user of Musescore for composing music for at least a year or two and in that time I've been using soundfonts. Recently, though, I got a SD-90 for these efforts, which sits comfortably on half of my desk space. Naturally, I wanted to use my very expensive sound box, so I went to set it up with the program.

Just one problem, though.

The Roland SD-90, (and potentially other modules), require two of the options below, A and B, selected to make sound. I confirmed this in Reaper and LMMS.

Is there any work around for this? Any input is appreciated greatly.