Hi Toni,
It might be worth asking on some of the Roland user forums that are around (I just googled "roland user forum" and came up with quite a few) if anyone else is doing what you want to do, and see how they're doing it.
If anyone is using a MIDI sequencer to do these changes, then there's quite possibly a way that we can get Notation Composer to do it for you
Good luck!
Sherry