LFO
ATMOSYNTH built-in module
A slow wave that moves something else rather than being heard itself. Patch its output into another module's modulation input — an oscillator's Detune, say — and that input rises and falls at the rate set here. How far it moves is set where it arrives. Its own rate is a modulation input too, so a second LFO patched into Rate speeds this one up and slows it down; how far, Rate amount sets.
What this module is made of is not shown here. Fork it into the editor to see for yourself.