There are lots of forums posts which allude to, or contain links to an AKAI hosted ftp from about 2000-2005 which stored some sample sets for the S5000 / S6000.
I was able to find a set of only the Splendid Grand Piano but it had been converted to SF2. I was hoping someone here might have it in Akai format.
If anyone has these old AKAI sound libraries kicking around still please let me know. I'd love to use and hear some of these. I'm interested in non AKAI libraries too.