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'Selective vibrato' consoles have two vibrato switches, so that the Vibrato effect can be applied to either manual separately or to both at once (or to neither).

In order to add selective vibrato to a NonSelectiveVibrato organ, the PresetPanel and the drawbar busses must be divided and connected to two matching transformers, each serving one manual. The Great or lower manual, matching transformer also serves the PedalClavier. VibratoTablets would be required, changing the drawbar base would be easier than cutting rectangular holes and severing busses.

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