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Rapscallion has two functions. Firstly, it gates a stereo input signal, releasing the gate for a fixed amount of time when triggered. Panning is applied and the signal is faded in and out during the “gate open” period. This function can be useful by itself, for example as a way of feeding selected portions of an audio signal to a “dub” effects chain.
Secondly, when triggered Rapscallion generates a control signal to be sent to the “mod” input of a delay tap on Catkins or Catkins Stereo, which will move the replay head for that delay tap during playback, speeding up or slowing down the delayed signal as it passes through the gate so that playback is pitch-shifted and/or reversed.
These two functions together enable Rapscallion to be used alongside Catkins/Stereo to produce similar effects to those produced by the Scapegrace plugin, selecting portions of a recording buffer and replaying them with pitch-modulation effects applied, except with far greater control (Scapegrace is wonderful, but chaotic…)
IMPORTANT NOTE: Rapscallion by itself doesn’t reverse or pitch-shift its input signal: the controls in lilac won’t have any effect at all on its audio outputs, but solely configure the “mod” output signal consumed by Catkins/Stereo.