Page "Modular synthesizer" Paragraph 7
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* LFO-A Low Frequency Oscillator may or may not be voltage-controlled.
It may be operated with a period anywhere from a fortieth of a second to several minutes.
It is generally used as a control voltage for another module.
For example, modulating a VCO may create vibrato while modulating a VCA may create tremolo.
The pulse wave can be used as a timing / trigger function.
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