Thought I'd post the websites I've found for the Yamaha SY99. I love mine. Thought I'd share some of what I found....
http://www.bjoern.com/sy99body.htm
http://www.neuroinformatik.ruhr-uni-bochum.de/ini/PEOPLE/heja/sy-list.html
http://www.kki.net.pl/sy99/
http://www.yamahasynth.com/classic/sy/sy.htm

Hope you SY99 users find this helpful...

Regards,

Jason