Modulation creates movement and character by allowing LFOs to change the way oscillators, filters, and other synth modules behave. Modulation in synthesis refers to the interaction between a source and a destination. Without it, our patches would sound like static tones most of the time. Modulation is used in synth patches to create movement. What Is Modulation? (Sources and Destinations Explained) Instead, we want to examine the modulation of sound – including its pitch, volume, and other properties. This is different from musical modulation, so we’re not talking about transposition and key changes.
To better understand LFOs, it’s important to get a feel for modulation.
This is because they affect parameters inside the patch, creating sweeps, flutters, gating effects, and even bizarre inharmonic noises depending on how they are used. They are important components in synthesizers that are vital for creating movement and interest inside any synth patch. But these are just simple applications – how deep can you really go with LFOs? We’ll find out… What Is An LFO? If you’ve ever played with tremolo, vibrato, flange, or phaser effects, you’ve heard an LFO in action.
They are very similar to regular oscillators (VCOs or DCOs on analog synths) except they generally oscillate much slower and exist primarily as a modulation source rather than as a musical tone. LFOs, or low frequency oscillators, are used in synthesizers for modulation – changing the pitch, filter cutoff, volume, and other parameters that affect the sound.
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