Nimrod,
there is (or at least there was) a manual to download (in PDF format) on the Roland site of Italy ( http://www.roland.it ; go to the download page, then choose arrangers).
On the manual you will find a list of all the effects available and every other thing you need to know.
Here is a link to a VA site: http://www.homestead.com/va7_roland/files/

Good luck with your choice!
Andrea