SUBTRACTIVE SYNTHESIS
So, there you are with your stack of instrument plug-ins. You know how to load presets and which knobs and switches to fiddle with to get certain results. But do you know what those knobs and switches are actually doing? And if you’ve imagined a particular sound, or heard something you want to recreate, would you have an idea of how to use a synth to craft that sound?
If your sound-design sessions usually involve randomly waggling knobs and flicking switches until you land on something you more-or-less like the sound of, then stick around – because over this series of features, we’re going to talk in-depth about sound synthesis, looking at the technicalities and the history and giving practical guidance, for all of the principal synthesis methods.
THE FUNDAMENTALS OF FUNDAMENTALS
In this first part of our study of the various aspects of synthesis, we’re taking a look at subtractive synthesis. To understand this principle – or any other form of sound synthesis for that matter – we first have to take a quick detour through the science of sound. A sound wave is a series of pressure changes, or waves of compression and rarefaction in the air or other medium and our ears hear sound because they are sensitive to these pressure changes.
The waveforms drawn in our DAWs or on an oscilloscope screen are a graphical representation of the pattern of compression and rarefaction that comprises a sound wave – compression corresponds with where the line on the graph is above the horizontal centre and rarefaction corresponds with where the line is below
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