23Other modulation tools
Modulated delay lines are at the heart of a few other effects. Although neither phasers nor tremolos are based on delay lines, their operation is based on modulation. This chapter covers these tools.
Vibrato
Vibrato is the effect caused by rapid and subtle alteration of pitch. Such an effect can be part of a vocal performance, is an extremely common playing technique with string instruments, a known technique on guitars, and can also be the byproduct of the Doppler effect as produced by a Leslie cabinet (which was originally called a “Vibratone”). Vibrato can be achieved by modulating a delay line—without mixing the source signal. Subtle settings create similar effects to those that occur in nature. The evident pitch ...
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