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An automatic pulsing interruption of the signal. Like reverb, this is usually a function built into the amp but is occasionally freestanding. Also, like reverb, is usually controlled by a foot switch plugged into the back of the amp and altered in amount with a knob (usually two) on the front of the amp. The two knobs are Depth (mix of dry to wet) and Speed (speed of interrupt or pulse in the signal).
Actually, vibrato in this case is a misnomer. This pulsing variation in volume is really tremolo. Sometimes this function is correctly identified on an amp as Tremolo, not Vibrato. But usually not.
Vibrato is a gentle (or sometimes extreme) oscillation in pitch, like that produced by pumping on the whammy bar on a guitar.
Ivy: "Disappointed" (subtle).
Hooverphonic: "2Wicky" (actually an Isaac Hayes sample, on the intro guitar line).
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