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A Tremulant just produces a periodic variation of the amplitude or volume. There's no frequency modulation like a vibrato. That's why it doesn't sound so intensive like the vibrato, which was introduced with the BV / CV models. The contruction of the tremulant was a set of switches, which shorted some resistors. These switches were driven by a cam shaft, which was coupled to the run motor. Intensity was controlled by a variable shunt resistor and affected both manual. The model E had tremolo intensity controls for each manual.

Steffan Diedrichsen

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