I've noticed something when reading the specs of synths/modules/SRX boards, For instance they say that the SRX boards have 64 MB of Wave ROM "When converted to 16-bit linear", I was looking at the XP-10 at www.rolandmusik.de and found out that it had 8 megs of Wave ROM, and 16 MB when converted to 16-bit linear, I've also downloaded the demos of Hyper Canvas and Super Quartet (Software Synthezisers), and the website said that Hyper Canvas had 26 MB Wave Rom, but when I looked at the file where the samples were located it was 13 MB, and the same thing with Super Quartet, they said it had 60 MB's of Wave ROM while the Sample file was only around 30 MB's.
So I guess the actual Wave ROM of the SRX boards are 32 MB.
Just an observation .

Greetz,
Marcel