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crescendo piston

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crescendo piston

Postby fermata » Tue May 09, 2017 10:38 pm

Does anyone know what a crescendo piston is supposed to do? I've seen it online on a few organs. Maybe it is a British thing? One organ had such a button where a coupler rail often goes, I think it was a Copeman Hart.
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Re: crescendo piston

Postby IainStinson » Wed May 10, 2017 4:14 am

I think it might select an alternative crescendo sequence (cf Rogers)
7. Crescendo B Piston – causes the crescendo shoe to produce an alternate sequence of stops from softest to loudest. It is “reversible.”

It could also enable or disable the crescendo pedal.

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Re: crescendo piston

Postby Andrew Grahame » Wed May 10, 2017 7:52 am

Some sample sets (and real organs) have a piston to enable or disable the crescendo pedal to prevent accidents. St Anne's Moseley has 3 such pistons - one for each department.
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Re: crescendo piston

Postby Antoni Scott » Fri May 19, 2017 7:47 am

Perhaps it is a stepper piston which upon repeated depressions retrieves a sequence of stop combinations.
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