Oscillator sync

This can produce a harmonically rich sound, the timbre of which can be altered by varying the synced oscillator's frequency.

[1] The leader oscillator's pitch is generated by user input (typically the synthesizer's keyboard), and is arbitrary.

In some cases,[3][4] Soft Sync refers to a process intended to nudge and lock the follower oscillator into the same or an integer or fractional multiple of the leader oscillator frequency when they both have similar phases, similar to a phase-locked loop.

The phase of the follower is advanced by some amount when the leader oscillator level crosses some threshold.

When the leader oscillator crosses some threshold, the normal reset of the follower is disabled: it will stick at its final level, positive or negative.

[citation needed] For digital oscillators, Reversing Sync may less frequently generate aliasing.

A variety of synthesis architectures are based on sync, often used in conjunction with amplitude, frequency, or phase modulation.