Using the Stern-Brocot sequence to generate a binary try of rational numbers.

Here, the fractions are used for FM synthesis, determining the ratio of the carrier frequency to the modulator frequency. The reference frequency is set using the slider at the bottom, and the numerator and denominator determine the multiples for the carrier and modulator frequencies respecively. The "index of modulation" slider sets the amplitude of the modulation (how far an excursion from the central carrier value the modulator periodically drives the carrier frequency).