This fairly early (#185) and super clean 3Leaf Proton has spent most of it's life in a display case amongst various rare overdrives, fuzzes and boost pedals. It was my Jerry tone until Mike Beigel Started making mini-mutrons under the Mu-Fx name. There is a reason these are considered among the finest. It is a very smooth and full sounding envelope filter that responds beautifully and works really well with bass and keyboards and of course, guitar. Plus, I believe these were made with the same chip as a vintage Mu-Tron. Switch tips incuded.