As Peter mentioned, all MIDI commands that are normally intended for the users of the FI are listed in the manual. The NRPN commands are used for communication with the editor. We have no reason to keep this confidential, so I can post the description here, but with a warning:
1. This description served as the guide to the implementation of the editor. While I think that all information here is accurate, I cannot guarantee this. It can happen that we made some late changes that were not updated in this guide.
2. If you use these commands you use them on your own risk. E.g. if you adjust any parameter outside of the range as defined here, it can happen that the program will freeze (but you cannot cause permanent damage).
3. We cannot provide further support for this, so do not ask questions about it (probably we could not answer it anyway).
Andras Szalay