So far in this book, we have looked at subtractive synthesis, where you start with a “noisy” sound source and the tone is then shaped with a filter. With subtractive synthesis, you can easily change the characteristic of a sound by changing the sound source—in other words, by changing the source waveform.
However, subtractive synthesis is not the only way to create sounds. For instance, you could use:
Additive techniques, where you bring together a number of waves to create a wholly new tone
Modulation techniques (such as frequency modulation synthesis), where one waveform distorts another wave to create a radically different sound
You can then (but you don’t have to) use these other synthesis methods in ...