Editing Oscillator sync (section)

==Hard Sync==
The leader oscillator's pitch is generated by user input (typically the synthesizer's [[Musical Keyboard|keyboard]]), and is arbitrary. The follower oscillator's pitch may be [[musical tuning|tuned]] to (or [[musical tuning|detuned]] from) this frequency, or may remain constant. Every time the leader oscillator's [[periodic function|cycle]] repeats, the follower is retriggered, regardless of its position. If the follower is tuned to a lower frequency than the leader it will be forced to repeat before it completes an entire cycle, and if it is tuned to a higher frequency it will be forced to repeat partway through a second or third cycle. This technique ensures that the oscillators are technically playing at the same frequency, but the irregular cycle of the follower oscillator often causes complex timbres and the impression of [[harmony]].  If the tuning of the follower oscillator is swept, one may discern a [[Harmonic series (music)|harmonic sequence]].<ref>{{Cite web| title=Fourier series of a Hard-Sync Sawtooth | url=http://www.cs.nuim.ie/~matthewh/HardSync.pdf | archive-url=https://web.archive.org/web/20171107055212/http://www.cs.nuim.ie/~matthewh/HardSync.pdf | archive-date=2017-11-07}}</ref>

This effect may be achieved by measuring the zero axis crossings of the leader oscillator and retriggering the follower oscillator after every other crossing.

This form of oscillator sync is more common than soft sync, but is prone to generating [[aliasing]] in naive digital implementations.