This is my first filter design for Eurorack. I seem to always use my multi-mode filters (built from kits) in lowpass mode so that's what I've designed for myself. I didn't want to jump into a multimode filter yet, it just complicates things I don't have a good grasp on yet. The module uses 8HP. For this filter I'm using the AS3320 filter chip which I picked up along with various other chips in that series from Electric Druid . When I went to figure out the circuit I ran into the biggest road block which is that the data sheet is nearly useless. It shows a sample circuit for low pass, high pass and other use cases but they are a tangled mess of wires, very poor layout for helping anyone understand the chip. In an age where the data sheet doesn't need to fit in a single page, there's no excuse for providing such bad documentation. Rant over. These chips are clones of CEM3320 and the full data sheet for that is somewhat better. Here's where I found it . In...