Personally I think the one B3 patch on the session board & in the XP30 / JV1010 is the best organ sound I've heard from the JV range - I had a quick play on the 60's & 70s board in a shop and wasn't that impressed, though I didn't have time to hear all of the patches. Not a big fan of the built in patches in my XP80, though IMHO the 3rd GM (!) organ patch is the best of a bad bunch.....

Pete