I use my JV-1010 with computer software...
but I have no idea what the system exclusive messages are for "Roland's" typical reverbs...
(for use with my JV-1010 - I always use it in performance mode)
e.g. Room 1,Room 2,Stage 1,Stage 2,Hall 1, Hall 2, Delay, Pan-Delay.
could anyone tell me where I could get these messages...or what these messages are...? Thank you for your time.

(p.s. in the back of the manual is this message...
Offset Address 00 28
Size 0000 0aaa,
but I'm after the messages that start with
F0 and end with F7)
thanks again

I looked into it myself and it took me a while to figure out what the messages could be. But i finaly got some numbers out of it!

This is the message to send to get the Room1 reverb, and changing the last 00 (between 28 & 4D) to 01, 02, 03 and so on to get the other types (in the order you mentioned below)

F0 41 10 6A 12 01 00 00 28 00 4D F7

But, the checksum is probably wrong in this message because the JV sais CSE (which means checksum error) but it works anyway.
Good luck!