LFO
LFO Type: noun, acronym Pronunciation: /L-F-O/ Also spelled or known as: L.F.O. What does LFO mean? Low-Frequency Oscillator. LFO stands for Low-Frequency Oscillator, an LFO is an oscillator typically below the range of human hearing, used as a modulation source to add vibrato, tremolo and other effects to sounds. LFO’s are mostly on synths.