I think the SA nuances CAN be assigned to foot switch on Yamaha. I don't have one right now, but I remember even on the S900 that you could put in a guitar knock or similar things with your foot.
DonM
Correct, Don...SA Sax, for instance can have a breath noise and key noise assigned to pedals...SA Concert Guitar can have two types of body knocks.
SA2 Breathy Sax can use pedals for Bend Up/Down or Gliss Up/Down.
There are many other SA/SA2 pedal functions depending on the voice selected...too many to list here...for those interested, the online available manual gives lots of information.
Ian