I don't have a Genos keyboard but the S950, and I agree with Fred.
What he has described is exactly how I have all my VH setup and then connect them to a Registration, I have never had any issues. I do connect 2 completely different styles together (because of the tempo change). In this particular song's case, 6 of the registrations are used for moving through the song. The last 2 are set up for my singing, #7 is for singing solo with just Reverb and #8 is setup for adding in the Backup singer with Reverb as well. I can then jump back and forth between #7 and #8 mic setting no matter what part of the song I need to switch them.
I believe the Genos now has 10 registration buttons, which is even better.
Regards
Drake