Low-frequency oscillator

A low-frequency oscillator (LFO) is a module that generates a repeating control voltage, usually at a rate below 20 Hz. It is commonly used to modulate parameters like pitch, amplitude, or filter cutoff frequency, creating effects such as vibrato, tremolo, and filter sweeps. Common waveforms are sine, triangle, square, and sawtooth, though more complex shapes are possible. LFOs add motion to a sound or automate a parameter.