Hi folks --
Trying not to add confusion...
The External Controller page is legacy support for the old Yamaha MFC10 Foot Controller. As MFC10 users will likely attest (where's Uli when we need him!), the MFC10 had insane limitations. [Yamaha over-engineering strikes again.] So, the MFC10 could only send CC#7, 1, 2, 3, and 4.
Use of the External Controller page is purely optional and was intended as a convenience for MFC10 users.
Genos will receive and recognize the CCs specified in the MIDI Implementation chart at the end of the Data List PDF. That said, one must mind the internal routing of data from the physical MIDI ports (5-pin and/or USB) to destinations within Genos. By default, incoming MIDI data is sent to the Song parts. Sounds like Michael wants to control RIGHT1, RIGHT2, etc.
The internal routing is set through the MIDI Receive Channel Settings (page 146 of the Genos Reference Manual). If the Roli is sending through Port 1 on MIDI channel 6, then that entry needs to point to RIGHT1, RIGHT2, etc.
The CCs shown in the MIDI implementation chart are the ones for which Genos will respond. These cannot be remapped. So, if Roli pressure (or whatever) needs to control cutoff, the Roli had better send CC#74. The controller assignments shown in the MIDI message chart beginning on page 95 are more helpful in this regard.
I have never successfully used the XG Alternate Controllers mentioned by Joe. Maybe it's just my stupidity or the lack of any good examples from Yamaha.
Personally, I would forget about the External Controller page entirely.
Hope this helps -- pj