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Wah-wah (music)
Wah-wah (or wa-wa) is an imitative word (or onomatopoeia) for the sound of altering the resonance of musical notes to extend expressiveness, sounding much like a human voice saying the syllable ''wah''. The wah-wah effect is a spectral glide, a "modification of the vowel quality of a tone" .
==Technique==
The wah-wah effect is produced by periodically bringing in and out of play treble frequencies while a note is sustained. The word is derived from the sound of the effect itself—in other words, it is onomatopoeic. The method of production varies from one type of instrument to another. On brass instruments, it is usually created by means of a mute, particularly with the harmon (also called a "wa-wa" mute) or plunger mute. Woodwind instruments may use "false fingerings" to produce the effect. Any electrified instrument may use an auxiliary signal-processing device, usually operated by a pedal. This electronic means is most often thought of in connection with the electric guitar, but is also often used with the electric piano .
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