Shaping Sound Through Volume Amplitude Modulation (AM) is a fundamental concept in audio synthesis an communication. It's a way of varying the loudness (amplitude) of one sound wave based on the shape of another. This seemingly simple process can create a surprisingly rich variety of timbres, from subtle tremolo to aggressive, metallic sounds.

In the vast and ever evolving world of sound synthesis, Frequency Modulation (FM) stands out as a powerful and distinct technique. It's responsible for some of the most iconic and unique sounds in music history, from the piercing bells of the Yamaha DX7 to the rich, complex textures found in modern electronic music. But what exactly is FM synthesis, how does it work, and why does it create such characteristic tones?