RM,

You're spot on. The Korg MS20 does, in fact, use the Sallen-Key type
filter. The reason Korg went with that particular design (to the
best of MY knowledge) it is a relatively inexpensive filter that is
easily switched between LP, BP, and HP. In other words, Sallen-Key
filters are a cheap way to include more than one filter.

Regards,
Kevin

--- In Doepfer_a100@y..., "ringmod45" <ringmod45@y...> wrote:
> hi duff, to the best of knowledge, the Korg ms-20 filter are of the
> Sallen-Key variety and not diode based. hope this helps.
> RM
>
>
>
>
> -- In Doepfer_a100@y..., "duffnuff" <duffnuff@h...> wrote:
> >
> > > they will release the
> > > a102 diode filter,in about august or september(for 75 euros,i
> > > think...).hooray!!!
> >
> > i'm happy to hear this. particularly the 75 euro part. i've
been
> > using a friend's ms20 on loan for a month or so and i'm hooked
> > on the diode filters. i hope the doepfer diodes are capable of
HP
> > as well as LP so i can configure a pair in series similar ro the
> > ms20 layout. thanks for the news, bakis!
> > -duff