Hi arranger_yes_pc_no
I still haven’t a clue what you are on about however:

If you mean arranger software for use on a standard computer, then Wersi has NEVER produced any.

The only company’s I know that produce this type of software are;
http://www.live-styler.de/home/
http://www.livearranger.com/
http://www.varranger.fr/
http://www.1manband.nl/omb.htm

If you mean a Midi Expander for use with any keyboard; then the EX1 model (Which used the same OAS software system as their Organs/Keyboards) was produced from 2003 – 2009, but has now been discontinued.

If this is not the information you require, please explain in more detail.
Regards

Bill