Hi Bakis

> it's a Switched Capacitor filter. don't ask me though
> anything more, i do not know. i guess that it sounds
> quite different from the other filter modules dieter

All early Akais samplers (S612, S700, S900, S950) used switched
capacitor filters.
A SC-Filter can (but must not) be very steep (e.g. 96db/Oct). It is not
very easy to describe the sound. It sounds like a 12dB filter set to
high resonance, but without the feedback sound (if you can imagine that).

Regarding the function. With a quick google I found a very nice
explanation in german:
http://www.elektronik-kompendium.de/public/schaerer/scf1.htm

And another in english but not as good understandable and more mathematical:
http://www.swarthmore.edu/NatSci/echeeve1/Ref/FilterBkgrnd/SwitchedCap.html


Florian