Patches and discussion for Ensoniq VFX family

My wife is an experienced pianist and piano teacher.  She is 
particularly interested in the piano sounds, and noticed that the 
sustain on most of the SD-1 piano programs is quite limited.  I 
searched through the Musician's Manual, but can't find any control 
that changes the amount of sustain a program has.  The sustain pedal 
works, only the sustain is limited.  I suspect there is an answer 
somewhere in Section 8  of the Musician's manual, "Voice Programming" 
but none of the parameters seem directly related to sustain.  Does 
anyone have any suggestions?  


Jim