Lift up the hood of the Ubermut overdrive (yep, you can lift it just like a car hood) and you'll find a clever little slot that enables you to switch out diodes (which you can buy from Ubermut.) Predictably, the sounds on tap are myriad—from smooth overdrive to nasty germanium fuzz tones, making this one of the more flexible drive pedals you'll ever tinker with. A fair price too at 185 bucks.