I've had conflicting statements given to me. I'm referring not only to the basic JV/XP sound set(found on all XP's), but also the expansion boards. One says it's only 32 kHz, the other 44.1 kHz. Obviously older synths may have the 32 KHz, but I'm planning to get the XP-30(which is new), but concerned with its sounds' sampling rates. So which is it?
Pls. also refer me to any site which can confirm this issue.

Just post your reply, and I'll get back to u.

Thanks.

44.1kHz
See the Roland 1992 Product Guide.
It is not available on-line however.