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A filter isn't a bad idea... but the voices here (Doepfer, Rings, Plaits) also have filtration built in, plus there's the Optomix. So that might not be as pressing a need as it seems, depending on how you like to patch. (I know in my case I have several filters, but they're actually among my least-used modules, for exactly this reason.)

Zadar and a switch are also great suggestions. If you go the latter route, I'd highly recommend Noise Engineering's Vice Virga, which gives you a ton of options in 8hp.