Boss began in 1976 with the introduction of the famous CE-1 Chorus pedal. After that they introduces the OD-1 OverDrive pedal which guitarists used to boost the signal of there guitar before it got to the amplifier. It allowed you to overdrive your guitar amp's preamp section without sounding to harsh or metallic. They were one of the first to include recessed control knobs and silent switching.

DigiTech is an audio company that specialises in effects pedals and consoles for guitars and basses. One success under DigiTech's belt is the Whammy pedal, a pitchshifting pedal with a variety of modes; octave down, octave up, and various harmonizing abilities. The original Whammy pedal was popularized by Tom Morello, Jonny Greenwood, Jack White, and Steve Vai.

Behringer is a German company, founded in its present form in 1989, and is a world-leading designer, manufacturer and distributor of professional audio equipment, musical instruments and their related products. The company provides a comprehensive product range covering multiple product categories including Audio Technology, Loudspeakers, Amplifiers, Musical Instrument Amplification.

Line 6, founded in 1996 and based in Agoura Hills, California, is a manufacturer of digital modeling electric guitars, amplifiers and effects processors. In the mid-1990's, Line 6 set out to meet the needs of today's guitarist by harnessing technology to turn a wide range of great tone into a reality for every guitarist.

Roland Corporation is a Japanese manufacturer of electronic musical instruments, electronic equipment and software. It was founded by Ikutaro Kakehashi in Osaka on April 18, 1972 with 33 million yen in capital. Today Roland has factories in Japan, the United States, Italy, and Taiwan.