This is one of the funniest things on the whole internets. Mark Twain, a mad scientist, and it ends with a great Steely Dan tune. What else could you want? How about the rest of that song:
First, I am bound to state that I received this pedal at no cost for review. Having gotten that out of the way …
What is a tremolo? As relates to electric guitar, tremolo is a modulation in the volume of the sound. That's all. Back in the way early days, this was an effect that could be implemented very inexpensively using the often-unused half of a pre-amp tube in an amp. This made it a popular feature for amp manufacturers, which in turn led to its use by musicians, especially back when there were basically no other effects.