I built this module last weekend and at first tried to run an Erica Synths Pico Drums through it with little luck. The design of this module is such that no little to input results in self oscillation. The breaks in between drum beats created results that were not what I expected. That said, once I ran the Disting Mk4 running one of VCO algorithms this filter came alive and the results were fantastic. I really like the results I'm getting from this module but I feel like I now need a second filter just for drums.