High Quality Content by WIKIPEDIA articles! A wah-wah pedal (or just wah pedal) is a type of guitar effects pedal that alters the tone of the signal to create a distinctive effect, intended to mimic the human voice. The pedal sweeps the peak response of a filter up and down in frequency to create the sound (spectral glide), also known as "the wah effect."The wah-wah pedal has a very specific and technical circuitry and housing structure. Therefore, all other previous effects circuits and devices, prior to 1966, that share similarities with the wah-wah pedal are not actually affecting the signal in the same manner and cannot be considered early versions of the wah-wah pedal. However, custom experiments from time to time made sounds that approached the formal product, including Chet Atkins' 1961 recording of "Boo Boo Stick Beat".

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