A slow pitch oscillation; a periodic change in frequency, often controlled by an LFO, with a periodicity of less than 20Hz, most commonly about 5Hz-8Hz. Vibrato is created in the wave oscillator when a modulation signal is sent from an LFO into the frequency modulation input of the oscillator. In synthesizers, vibrato depth is the intensity of the effect, and vibrato delay is the amount of time a note is set to sustain before the vibrato effect enters. Compare with tremolo.