Build any waveform from sine harmonics — additive synthesis
Base freq:
220 Hz
Fourier's theorem: any periodic signal can be expressed as a sum of sine waves at integer multiples of a fundamental frequency — harmonics. This is the foundation of all digital audio synthesis. Each slider controls the amplitude of harmonic n: f(t) = Σ Aₙ sin(2πnf₀t). A sawtooth wave has all harmonics Aₙ = 1/n; a square wave has only odd harmonics; a triangle wave has odd harmonics with Aₙ = 1/n². Use the Web Audio API to hear the synthesis in real time.