This is the Doepfer A-103. At $109, it is one of the cheapest fully fledged Eurorack filters. It is an excellent 18db transistor ladder with progressive overdrive on the output state and
Doepfer A-108 6/12/24/48dB Low Pass Filter
Best Eurorack filters: 8 filters you should have in your rack - gearnews.com
Eurorack Filter Comparison | Moinsound's Blog
Wasp Filter : r/modular
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