The Third Rail is Function f(x)'s venture into the realm that is overdrive, a territory that is flooded at the moment, but manages to stand out. Using two discrete overdrives with NPN transistor, and three options of different clipping, you have tones of options all while achieving very amp-like overdrives. You have the choice of Schottky, silicon, or no diode style of clipping, each very distinct and full of depth. The goal behind these different clipping stages wasn't just varying gain sounds and headroom, but also compression and sensitivity, everything you love about overdrives. The right channel has a bass cut switch and the left channel has a high gain switch to add even more to your choices. All of that alone is a killer pedal, everything you need, but Function f(x) takes it further. The footswitches are programmable, with three settings. You can have two independent channels on or off in any combination of your choosing. Another is a bypass switch for one and the other switches between the channels, one or the other. The last keeps them both on for full throttle, and the other switch is a momentary boost switch to some stuttering or feedback craziness. This thing sounds as cool as it looks, and will probably replace all your overdrives on your board. You won't need anything else.