Recently won this on Ebay:
http://www.benl.ebay.be/itm/270954369857?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
And I was the only bidder. Your loss. Now I have both original demo tapes!!
They can be downloaded from the official Sindrome site
http://www.sindrome.net/