Summary I built the Attenuator that I found mentioned here for my Werkstatt but didn't want to use a guitar pedal box for it, so I created a Eurorack panel to hold it since I have a lot space in my rack currently (just starting out with modular). It can be used with any CV/audio source so it was a nobrainer to add one...I might make multiples while I still have the room. It's such an easy mod to build (500k potentiameter and two 3.5mm jack inputs wired together) but adding it to the Werkstatt makes a world of difference when you patch in different sources: https://www.youtube.com/watch?v=AePYam2PpNQ