The first of two movies on the WMD Digital VCA looks at how it can delay an input control voltage such as an envelope until the incoming audio has reached a zero crossing of its waveform. Changing amplitude while the waveform is at zero means there will be no spurious clicks from sudden attacks, while suddenly opening a VCA while a waveform is somewhere else in its cycle can result in an abrupt change and therefore a click.
This second of two movies on the WMD Digital VCA explores using it as an intelligent sample and hold where changes in its amplitude only occur when a gate signal goes high or low. This “quantizes” changes so they only occur at the start of a note (or optionally, at its end).
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