Effects pedal

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An effects pedal (or stomp box) is an electronic effects unit housed in a small metal or plastic chassis used by musicians, usually electric guitar players, to modify their instrument sound. Musicians playing electronic keyboards, electromechanical organs, the electric bass, or electric violin also use effects pedals. These devices alter the sound quality or timbre of the input signal, adding effects such as distortion, fuzz, overdrive, chorus, reverberation, wah-wah, flanging, phaser or pitch shifting. The sound of a guitar or other instrument that is played without an effects pedal is described as "clean", "straight" or "dry."

The TS9 Tubescreamer from Ibanez, a widely-imitated pedal adding a vacuum tube-like overdrive sound using op-amps.
Users refer to them as pedals because they sit on the floor and have large on/off switches on top that are activated using the foot. Some pedals, such as wah-wah or volume pedals, employ what is known as an expression pedal. Expression pedals are manipulated while in operation by rocking a large foot-activated potentiometer (pot) back and forth.[1] The relative position of the expression pedal changes some parameter of the effect, such as a filter response in a wah pedal.
Effects pedals permit the musician to activate and deactivate effects while playing an instrument. Some musicians use rack-mounted effects processors controlled using MIDI instead of or in addition to effects pedals, since the greater size of the rack form factor usually allows more flexibility and processing power. Others prefer only using a few analog effects pedals, to avoid sending the instrument signal through multiple stages of analog-to-digital conversion, as occurs in more complicated and powerful digital effects processors.
Contents
1 Guitar
2 Pedalboards
3 Switching pedals
4 Related pedals
5 Tributes by musicians
6 See also
7 References
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Guitar
A guitar effects pedal is connected into a signal chain using two 2-conductor (conductor and shield) instrument cables with 1/4" jack plugs (or "phone plugs"). The input jack is usually on the right side, and output on the left; thus the signal path for a chain of pedals is usually right-to-left. Some effects pedals have stereo out via two mono out signals, and a few have stereo input jacks as well as stereo output jacks. Several pedals can be linked together in a chain. An effects chain can be placed between the guitar and the guitar amplifier's preamp section, within the guitar amplifier's effects loop, after a guitar amplifier's DI (Direct Inject) line-level tap jack, after a "dummy load" attached to the guitar amplifier's output jack, or at the mixing board to process the miked guitar-speaker signal.
When a pedal is off or inactive, the signal coming in to the pedal is shunted onto a bypass, so that the "dry" or unaffected signal can go on to other effects down the chain, and thus any combination of effects on a chain can be created without having to reconnect boxes during a performance. "True Bypass" means the presence of an isolated wire passing straight through the effects pedal, as opposed to "buffered bypass," which uses active circuit elements to connect the input to the output. While these are 2 popular configurations, there are other bypass methods, such as input-only bypass which is semi-passive.
The instrument signal can be routed through the stomp boxes in any combination, but to shape and preserve the clarity of the basic distortion tone, it is most common to put wah and overdrive pedals at the start of the chain; pedals which alter the pitch or color of the tone in the middle; and boxes which modify the resonance, such as flanging, delay (echo) and reverb units at the end.
EQ, auto-wah, phaser, and vibe effects fit naturally at any position without introducing intermodulation distortion, while the emphatically time-based effects can sound unnatural and chaotic if placed early in the chain. Effects pedals can be used together with other effects units and a guitar amplifier's built-in effects. However, when too many effect pedals are used, unwanted noise and hum can be introduced into the sound. Some performers use a noise gate pedal to reduce the unwanted noise and hum.
Pedalboards

A photo of Rage Against the Machine and Audioslave guitarist Tom Morello's pedal board.
A guitar pedalboard is a flat board or panel which serves as a container, patch bay and power supply for effects pedals. Some pedalboards contain their own power supply, in order to power many different pedals. Pedalboards assist the player in managing multiple pedals. The entire pedalboard can be packed up and transported to the next location without the need for disassembly.
Pedalboards often have a cover or case which protects the effects pedals during transportation. Some boards use soft cases or gig bags,...(and so on)

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