What is Wah-Wah?
Wah-wah (or wah) alters the frequencies (EQ) of the sound by rocking the pedal back and forth. Changing the position of the pedal creates a sweeping frequency filter, which emphasizes either the bass or treble frequencies. This sounds a bit like the human voice saying the words, “wah-wah.”
This effect was inspired by 1920s jazz trumpet and brass players, who used mutes to make their sound more expressive.
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THE ELECTRIC FLUTE:
A BEGINNER'S GUIDE TO PLAYING FLUTE WITH EFFECTS