Hi Diki
Computers are just a motherboard, CPU, Ram and Hard Disk and so can easily be upgraded to the latest spec, in fact OAS 7 will not run on the earlier OAS instruments as they are just not powerful enough, (They also ran on WIN 98) and this is why it cost a little bit more to upgrade for older uses, as the computer parts and OS have to be upgraded.

As to Vista, Wersi are no doubt experimenting, but I have to say the current version of Vista is a bit of a disaster. (Certainly not worth upgrading from XP yet)

Wersi owners have been pushing Wersi to get all there information in English for a while now, and they did promise at the Pakefield Festival that they would be addressing this problem, so hopefully it will be easier to find out details in the future.

OAA
As far as fills/breaks etc are concerned, if I have interpreted the German manual correctly (Fortunately it has screenshots in it) the styles can be broken up into 18 different parts in various combinations.

Chord recognition system algorithms are also way in advance of other manufactures instruments, plus many other features unique to Wersi are incorporated. (With still more under development) Unfortunately most people always seem to mention the direct play of Yamaha styles, (Which actually sound more live then the originals due to a better sound system) when in actual fact it is only a Small part of the OAA.

BTW Did you know that Wersi were one of the first manufactures to incorporate a Humaniser function on their Rhythm and Accompaniment units fitted to their organs in 1984.
Enjoy whatever you play

Bill

As an addition here is the manual for the OAA, unfortunately still in German but with plenty of Screenshots which should give you some idea. (The manual is for Revision R17, however the latest OAA (OAS7) version is R22 and so there are additional new features that are not included in the manual)
http://download.yousendit.com/7CA6CA4C1F7AE461



[This message has been edited by abacus (edited 10-14-2007).]