Muted trumpet

produce an effect also known as “the wah effect” or “wah-wah”. Later “the wah effect” became an expressive tool in its own way, that could be achieve with an electric guitar and a “Wah-wah pedal”. See Wah-wah in music on (chosen) related tag: wah - use of the wah wah pedal Edit this Artist photo: Duke Ellington