Vibrato audio effect.
(Vibrato is a musical effect consisting of a regular, pulsating change of pitch. It is used to add expression to vocal and instrumental music)

Using:

#include "BerVibrato/BerVibrato.h"
//... BerVibrato vbr;
vbr.initialize(SampleRateHz);
//...
vbr.setDepth(depth); // depth (amount) from (0; 1]
vbr.setFrequency(freq); // Vibrato rate in Hz
//...
vbr.processOneSample(sample);