In FL Studio, many of the stock virtual synths like 3xOsc and Sytrus have LFOs built into them. This is useful for imitating someone turning a knob up and down over and over again at whatever rate you set the LFO to, without physically needing an actual person to do it. If you assign an LFO to either of those parameters, the signal levels will follow the LFO settings in terms of shape, speed, etc. Still, this frequency creates an electrical signal that can be used to modulate parameters of other signals. If you spun it slow enough, you wouldn’t hear any sound at all because the cycle (oscillation) is too slow. Imagine spinning that same yoyo at a very slow rate (low frequency).
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