Mission 013
LFO — Slow Oscillator
An oscillator too slow to hear, used to move something.
An oscillator running too slow to hear — used to move something else.
+60 XP🏅 Modulation Mover
// WHAT IT DOES
An LFO (Low-Frequency Oscillator) is the same circuit as an audio oscillator, but running at 0.1-20 Hz — slow enough that you don't perceive it as a pitch. Instead, you use it to move another parameter up and down.
Four classic destinations: pitch (vibrato), (wobble/wah), amplitude (tremolo), and pan (auto-pan). Each one is a different effect just from re-routing the same LFO.
Most synths give you 2 LFOs with selectable shapes (sine, triangle, square, saw) and rate (in Hz or synced to tempo).
Think of it like → An LFO is a hand on a knob, slowly twisting it back and forth on its own.
▸ WHY YOU CARE
- • LFOs are the easiest way to make a static sound feel alive.
- • Every classic 'dubstep wobble', '80s vibrato lead', and '70s tremolo guitar' is an LFO at work.
- • Once you map an LFO somewhere, the patch breathes — no automation required.
// SEE & HEAR IT
▸ An LFO is a slow oscillator that controls something else. Pick the target to hear vibrato, filter wobble, or tremolo.
▸ HOW IT WORKS
▸ Signal flow — watch the dot
▸ SIGNAL FLOW
Glowing dot = your signal travelling through Live.
▸ LISTEN FOR
- • Vibrato wiggles pitch up and down evenly.
- • Filter LFO opens and closes brightness rhythmically.
- • Amp LFO pulses loudness; square shape = on/off stutter.
▸ WALKTHROUGH (4 steps)
- 1. DO: Pick a sustained synth tone. Assign LFO 1 (sine, 5 Hz) → pitch with small depth.▸ LISTEN: Vibrato.
- 2. DO: Re-route the same LFO → filter cutoff.▸ LISTEN: Filter wobble.
- 3. DO: Re-route → amp.▸ LISTEN: Tremolo.
- 4. DO: Re-route → pan.▸ LISTEN: Auto-pan, sound moves L↔R.
▸ COMMON MISTAKES
- ✗ Too much LFO depth on pitch — sounds 'seasick' instead of expressive.
- ✗ Setting LFO rate to non-musical values when the project is tempo-driven (use sync).
// QUIZ (QUICK)
Question 1 / 30 correct
An LFO is