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What is this dial on the organ in the Berliner Dom?

I am guessing that the dial may have something to do with air pressure but why would it be needed and what units do the numbers represent?

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Here is the performance where the dial is first shown - Warning Loud!"

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Could be a crescendo indicator dial. It is used to know what is the current position of the crescendo pedal on some organ.

Here Another example. (Image from https://pipeorgandatabase.org/organ/16221)

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  • Thanks - that sounds highly likely although I haven't yet been able to confirm online that this particular organ has a crescendo pedal. Commented Feb 12, 2023 at 21:33
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    The Sauer organ in the Berliner Dom has a crescendo pedal. That's the "Registercrescendo" in the "Spielhilfen" listed on the German language page. The Sauer organ has 113 registers. The dial is marked to 104, so I would assume that only 104 of the total registers are connected to the crescendo pedal. The display shows how many of the available registers are selected.
    – JRE
    Commented Feb 13, 2023 at 10:56
  • @JRE - Thanks, that's good enough for me! Commented Feb 13, 2023 at 12:16

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