Hi Ian

The Abacus is no longer available on its own, only in its organ guise as seen here and with the Synth pack costs about €12800 including Tax.

It is used by a lot of players in Europe as it breaks down into sections however the main unit weighs about 100 lbs. (It’s made out of Wood, Fibre & Steel) so is normally carried around in a wheeled case.

Most European players use synth sounds in combination with normal sounds, which is how you get the European Sound.

Don’t know of any synth demos on their own (I don’t have the synth pack so can’t help) but there is some articles here which explains the pack and includes some demos, although as he says in the write up, he does not know the first thing about synths.

The main thing you will notice is the full richer sound of the Wersi voices demonstrated compared to the more flatter less involving T4 sounds, as to which is the best has little relevance, as some will like one whereas other will prefer the other.

Hope this helps

Bill