Just to clarify after some years have passed and for documentation purposes (as google sends you here if you search for SAA1099 vs SAA1099P), you now CAN upgrade ANY sound blaster, be it CT1336 or CT1336A based.
https://github.com/necroware/sbcms
It's not mine, I don't have access to it, but someone posted pics on a facebook group.
Looks to be some soft of external 3.5 floppy, but what about that 15 pin connector? Maybe something proprietary? Does anyone have a clue?
I've googled that model number, the brand (seems to be related to 3M)...