Editing Low-frequency oscillation (section)

==Overview==
The primary [[Electronic oscillator|oscillator]] circuits of a [[synthesizer]] are used to create the [[sound|audio]] signals. An LFO is a secondary oscillator that operates at a significantly lower [[frequency]] than other oscillators, typically below 20&nbsp;Hz — that is, below the [[range of human hearing]]. The frequencies generated by LFOs are used as control signals which [[modulation|modulate]] another component's value, changing the output sound without introducing another source. Like a standard oscillator, this usually takes the form of a periodic waveform, such as a [[sine wave|sine]], [[sawtooth wave|sawtooth]], [[triangle wave|triangle]] or [[Square wave (waveform)|square wave]]. Also like a standard oscillator, LFOs can incorporate any number of waveform types, including user-defined [[Table-lookup synthesis|wavetable]]s, [[rectifier|rectified wave]]s and [[random number generator|random]] signals.

Using a low-frequency [[oscillation]] signal as a means of modulating another signal introduces complexities into the resulting sound, such that a variety of effects can be achieved. The specifics vary greatly depending on the type of modulation, the relative frequencies of the LFO signal and the signal being modulated, et cetera.