Summer NAMM '14 - Übermut Tone Pack Overdrive Demo Charles SaufleyAugust 6, 2014VideoPedal-builder Gordon Crum brings a stompbox to the market with an interchangeable overdrive that let's you switch germanium to MOSFET to silicon diodes in seconds.snamm-2014gearvideosgear-show-demoubermutoverdriveeffectswhats-newGearEffectsVideosNAMMReviews