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'''Oscillator sync''' is a feature in some [[synthesizer]]s with two or more [[oscillator]]s. One oscillator will restart the [[period]] of another oscillator, so that they will have the same
[[frequency]]. This produces a particular type of sound, rich with [[harmonics]], harsh but musical. The oscillator that resets the other oscillator(s) is called the master, and an oscillator that is reset by another oscillator is called a slave. The [[timbre]] can be altered on the slave oscillator by varying its input frequency. There are two common forms of oscillator sync which appear on synthesizers: ''hard sync'' and ''soft sync''. Soft sync is a term used for a variety of mechanisms.
==Hard sync==
In a hard sync setup, the slave oscillator is forced to reset to some level and [[phase]] (for example, zero) with every cycle of the master regardless of position or direction of the slave [[waveform]], which often generates asymmetrical shapes.
The master oscillator's pitch is generated by user input (typically the synthesizer's [[keyboard]]). The slave oscillator's pitch may be [[musical tuning|tuned]], or detuned
This effect may be achieved by measuring the zero axis crossings of the master oscillator and re-triggering the slave oscillator after every other crossing.
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==Sync-based architectures==
A variety of synthesis architectures are based on sync, often used in conjunction with [[
*[http://www.csounds.com/manualOLPC/vosim.html VOSIM]
*[[Physical modelling synthesis]]
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