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 ;-)