Hi Bakis

> the system-100 filter is identical to the
> sh5 filter,as far as i know.

I think you're right, and the system-100 filter is the typical roland
transistor/diode ladder, which should be already realized in the A-103
(please correct me if I am wrong).

Schemoes of the system 100 filter are here:
< http://fa.utfs.org/diy/roland100/101_op27.jpg >

Florian