Vox humana
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The vox humana is a short-resonator reed stop on the pipe organ, so named because of its supposed resemblance to the human voice. As a rule, the stop is used with a tremulant, which undulates the wind
Vox humana pipes
Vibrato
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Vibrato is a musical effect consisting of a regular, pulsating change of pitch. It is used to add expression to vocal and instrumental music. Vibrato is typically characterized in terms of two factors
A vibrato, sometimes called whammy bar, on an electric guitar allows to lower or raise the strings in order to produce vibrato.