Designed to work like Fuzz Face pedals that many players use as a LEAD BOOST. A Fuzz Face can be muddy, lacking note definition, too bassy, and lacking sustain. An overdrive can be not enough or too smooth. In contrast our design is transparent, has a better frequency response, and gives you that cutting edge for lead breaks.* The Heart of this pedal is a NPN Germanium Transistor.* Additional Gain Stage, a Darlington Pair of high gain silicon transistors for tons of volume output. This is great for overdriving tube amps or other overdrive pedals.* Buffered output so that it can drive pedals or amps with a nice high current and low impedance signal.* True-Bypass, offers you a clean true signal when the pedal is off.* Large Blue LED, a Killer Keeley Trademark!* Silicon/Germanium Toggle switch, this is like a gain Style switch. The ﾓSI" mode inserts two diodes (one silicon and one germanium in parallel) in the distortion circuit so you can have a modern twist on a vintage sound, increases the gain and compression a bit for more sustain. This is more of an overdrive mode.The ﾓGE" mode is just raw and open sounding!