You are very welcome, Terry, but not inadequacies, facts.
I have no evidence but from how the designer was talking I would guess there is the possibility the mega voices may use even more wave rom than the natural voices.
The 10 mega voices are only guitar and acoustic bass at the moment. This is because the many permutations of slide, pick, twang, hit, open string etc can only be used in the backing styles by having pre-programmed commands for each sample at the specific points as the style plays, this you can program easily in a preset style.
But it is unlikely you can play the mega voices live and achieve the same effect. But as I said earlier playing the mega voices live may still be better than before anyway, I just don't see how you can provide the preset style level of control information just by velocity switching, for example, and Yamaha agreed with this.
As I said earlier, I don't care what they call the voices, I just listen and see what I like