I just finished building the VCO and did a little bit of testing on it. I might update this post when I have used it a bit more. But first impressions it sounds really good. I like the FM and pulse input and have been playing with those CV inputs and lfo’s a bit and can imagine I would use this in some patches.
https://github.com/erica-synths/diy-eurorack
Difficulty to build: Hard /Medium
prone to make mistakes on. I did 🙂