The Vibrato Chorus effect is produced by mixing the vibrato-ed signal with the "dry" signal. It is enabled by the chorus switch on earlier vibrato-equipped organs, and by the rotary vibrato knob on later ConsoleOrgans ("C1", "C2", "C3" are chorus settings, while "V1", "V2, and "V3" are pure vibrato settings).
On the spinet models, Vibrato Chorus is enabled by a separate Vibrato Chorus switch, which adds chorus to the currently selected Vibrato setting (normal or VibratoSmall). The spinet models also feature ?VibratoCeleste.
See also Vibrato.
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