Frequency Modulation Defined
FM synthesis is the process of changing the frequency of one oscillator based on some other oscillator. Doing so creates “sidebands” which are extra frequencies above and below the original oscillator’s frequency.
At a relatively slow rate, this produces a vibrato effect when the modulation is performed by a sine or triangle wave. When the modulating oscillator is a square wave, the effect is a trill (rapid alternation between two notes).
Speeding up the modulation i...
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