To UncleDave and Squeak,
Yes, I confirm that the my Wersi OAS system is stable even after running some third party (music related)software.There are cases I had a blue screen but that was when I was experimenting with things i should not touch (being myself a software developer..) i think in the latest versions a lot of critical files are protected.Of cource I do not connect my keyboard to the Internet(though it is possible) and I do not install any software like games/utilities and other memory resident applications.Standard Hard Disk maintenance is essential (Scandisk/Defrag) and I have also a complete copy of my hard disk just in case the intrnal hard disk fails but I have not used it yet.Have in mind that this is a standard (qood quality) hard disk.
As a matter of fact I have upgraded the inernal PC from Celeron 700Mhz that was originally to a Pentium 4 3Ghz HT.This did not make a noticeblae difference in everyday use but I did it to be able to run sof synths in the background.The Icarus comes with an Athlon processor and the rest of the OAS systems with P4 2.4 and higher.
To Christian:yes there is an optional card for vocal harmoniser processing that can be installed in any OAS model.I use it too but I can recall now exactly how many 'programms' it has, but they include duett/trio/quartet with different harmony variations ,effects like gender change,'Mickey Mouse' and what I consider more usefull a mode where the harmony information is derived directly from the notes played (left hand split ).It is possible alos to assign any track af any SMF to the Harmoniser.The wet/dry FX and EQ as well as selection of output are progrmmable.The important detail here is that,being intrgated into the system,the whole proccesing is in the Digital Domain and the final sound is converted to analog only at the output.
Of course Harmoniser settings are programable.
There is a 'sof-button' on the touch screen to activate/deactivate the harmoniser fuction on the Microphone 1 audio channel.