The following currently available Eurorack filters have a 4 pole high pass mode.

Cwejman MMF-1
http://cwejman.net/mmf-1.htm

Division 6 Filtare
http://www.division-6.com/products/filtare-seiii-eurorack.php

there are probably more since there are now at least 42 Eurorack manufactures.

--- In Doepfer_a100@yahoogroups.com , "jakobsweb" <jakob.paulussen@...> wrote:
>
> ahh, that's one of the patch examples on Doepfer's A-172 page - the one without audio example. If you could share an audio example of that Thanks for replying to my post.
>
>
> --- In Doepfer_a100@yahoogroups.com , achtung_999 <heinrich.himmelwasser@> wrote:
> >
> > I totally agree, the A123 is an indispensable tool in my eurorack system. A
> > lot of my patches make use of this filter. Very often in tandem with an A122
> > and an A172.. Go figure that one out ;-)
> >
> >
> >
> >
> > On Tue, May 17, 2011 at 11:58 AM, jakobsweb
> > <jakob.paulussen@>wrote:
> >
> > >
> > >
> > > Hi everyone,
> > > I've been looking for a 4-pole highpass filter like the A-123 which is not
> > > being produced anymore - very unfortunately.
> > > On top I found out that no manufacturer of eurorack modules seems to offer
> > > them. Very odd!!!
> > > I emailed Dieter Doepfer who shares my view on the sonic capability of a
> > > 24db high pass and also my surprise at the general lack of demand.
> > >
> > > Dieter Doepfer mentioned that he considers developing a new 4-pole highpass
> > > filter with a different chipset from that of the A-123 (CEM3320) - provided
> > > there is enough interest in this forum!
> > >
> > > So - please forum - I hope you are interested.
> > > And should anyone have a spare A-123 ... I'd be greatly interested ;-)
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>