Distortion comes in many flavors, but the mechanics behind distortion is always the same. Distortion is the intentional overloading of a signal. If you've ever turned your stereo too loud and heard a crackling noise, you've experienced distortion. Distortion can be achieved by turning your amp up too loud and getting natural distortion, or you can use an effect pedal that will simulate the effect at lower volumes. Distortion comes in so many different types, that it is hard to explain how one is different from another.

Effects commonly come in two varieties: single pedals and rack units. The single pedals are self-contained units that usually have one effect. Rack units are digital processors that are programmable and contain many different effects that can be chained together. Racks were very popular in the 1980s, and while they're still in favor with touring professionals, most players prefer the convenience of single pedals. Single pedals are also much less expensive, running an average of $50.

Like amps, each pedal has its own character. What varies from effect to effect is the amount of distortion you can dial in and the amounts of control you have to power the sound. Some pedals, like those in the Tubeworks line, actually include a real pre-amp tube for distortion. Overdrive pedals specialize in low amounts of distortion and are favored by blues players who prefer adding only a little dirt to their sound. Overdrive pedals are typically used in conjunction with tube amps to improve the tone. A famous overdrive pedal is the Ibanez TS-9 Tubescreamer, used by just about everybody.

Distortion pedals are the harsher pedals and are used commonly in rock and heavy metal. These pedals dial in a lot of gain. If you're looking for a sound reminiscent of Metallica and Pantera, you'll need a distortion pedal. Listen to a variety of pedals and find the one that suits you the best.