Without modulation resources, a synthesizer is just a sophisticated organ. Modulation breathes life into a sound, adding motion to oscillators, filters, and amplifiers. Naturally, sound designers want as many options as possible for modulating synth parameters, but as is often the case with instrument design, pleasing every user equally is a daunting task: Some users want oodles of envelopes; others want LFOs galore.
What’s more, the feature set of a synth is a core component of its overall sound. While it’s fun to fantasize about softsynths and modular rigs having unlimited possibilities, the instruments that stand the test of time have a particular sound. And that sound is partially defined by the modulation tools that are available.
In this tutorial, we’ll look at a few ways to use envelopes as LFOs. Not every synth supports this level of versatility, but quite a few mainstream products—both software and hardware—do. Here are techniques for three of the most popular synths available now.