Sound waves can be described with surprisingly simple mathematics, and VocaSync reads the equations aloud.
A single tone
A pure tone is a sine wave. We can write it as
Energy
The energy carried by a wave grows with the square of its amplitude. In other words,
Adding waves
When two tones combine, their amplitudes add together:
Listen as each equation is spoken and highlighted in time with the narration — the whole expression lights up as it is read.