Transform Reference Guide
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SampleAndHold records the value of the incoming audio signal samplesIn whenever the value of the incoming control signal controlIn exceeds threshold. The recorded value is then "held" and output as a constant signal value until the next time the control signal crosses the threshold.
If a periodic ramping signal such as a Phasor is used as a control, the input signal will be subsampled at the frequency of the control signal. Of course, the control signal need not be periodic.
Sample-and-hold modules were common in many modular analog synthesizers and were often used for creating complex control signals.