Andrea,
All SRX card use preprogram performances which are the combination of canonical sounds and mixed effects. If the host keyboard doesn't have those effects, the final sound will miss a part.
I don't try yet the srx11 card in G70.
In the XV88, when you put "multi-effect" on, I heard the more hammer sound and resonance on the basic sound of the note, like you put your ears near the chord and piano mechanism.
Some people have pb with S series of Fantom on http://forum.fantomized.info/?action=show_all&fid=9