World of Synthesises
This is a sound pack option for Wersi OAS instruments, and is for those that crave the various synth sounds that have been available over time, (Not every body likes or wants these sounds on their instruments, and so Wersi give them the option, (Think of them as the software equivalent of the Roland ERX cards) they supplement the standard synth sounds on the instrument, and provide much more variation.
You will notice that all the mp3 files have various parts within, and relate to the different settings mentioned in the write up PDF file. (The reason I emphasised to read this first)
Ideally they would be demonstrated by someone who understands them (As he says in the text synthesisers are alien to him) but he has posted them to try and put over the flexibility of the Wersi instrument. (Unlike other boards/organs these voices do not use samples, but the physical modelling capabilities of the OAS 7 sound engine)
The guitar samples I posted in another post
http://www.synthzone.com/ubbs/Forum37/HTML/017751.html also uses the same sound engine as that which is in OAS 7, and which also emphasises the future proofing of the OAS instruments.
Madonna Tribute
This shows Wersi instruments in a more modern setting rather then the traditional settings of most Wersi performers. (Most players find their audiences prefer the more traditional sounds rather then the more modern sounds and most home uses feel the same)
All the sounds are 90% produced and played live on a Wersi Abacus running OAS 6 software, with a few additional sounds provided by a soft synth (Cant remember which one) running on an iMac. (I think this soft synth is only available for a Mac)
Once the Abacus is upgraded to OAS 7 I would guess the iMac will no longer be required due to its physical modelling capabilities of OAS 7. (OAS 6 uses just sampling)
Hope this makes it a bit clearer
Bill