I'm disappointed too that there isn't the extra FX block that was trumpeted in some of the early buzz about the S910.
The S.A. voices are unique from the other voices not only in how they sound but in that they have sounds that can be activated with a footswitch, like an inhale sound with an S.A. wind instrument, or a harmonic sound with an S.A. electric guitar, or a hand to wood sound on an S.A. nylon guitar.
Beakybird