LFO
An LFO (Low Frequency Oscillator) generates a repeating waveform below audible range (typically below 20 Hz) to modulate other parameters. In EDM, LFOs create filter sweeps, vibrato, tremolo, and the rhythmic pulsing effects in basslines—syncing the LFO rate to song BPM produces locked, rhythmically coherent movement.
Unlike audio-rate oscillators, LFOs operate in the modulation domain—their output controls parameters rather than producing sound directly. Common LFO modulation targets include filter cutoff (creates rhythmic filter movement), pitch (vibrato), volume (tremolo), and panning (auto-pan).
LFO shapes determine the character of the modulation: a sine wave creates smooth, gentle movement; a sawtooth ramp creates a one-directional sweep; a square wave creates abrupt on/off switching; a sample-and-hold random shape creates stochastic, unpredictable movement.
The most important LFO setting for EDM is BPM sync. Syncing the LFO to the song tempo (e.g., 1/4 note, 1/8 note, 1/16 note) ensures the modulation locks to the groove. A filter cutoff modulated by a synced 1/4-note LFO creates a rhythmic pumping effect that complements the kick pattern without sidechain compression.