The degree of suction in a pneumatic action, esp. a reproducing piano action, in which there are many different intensity levels to vary the force with which the piano hammers strike the strings.
interchangeable cylinder box
A type of cylinder box that incorporates toggles or latches that permit cylinders to be removed and replaced with relative ease.
Jahrmarkt Orgel
German term for fairground organ.
jazz cymbal
In the Hupfeld Pan Orchestra (and possibly other orchestrions) an effect produced by a small reiterating metal rod which strikes near the edge of the crash cymbal. * German: Beckenwirble.
jazz flute pipe
In dance organs, a stopped flute pipe or chimney flute with a special tremulant, consisting of a pallet covering the outside opening of a small hole drilled in the back of the pipe, opposite the mouth. When a jazz tremolo (or vibrato) effect is desired, the pallet opens and closes rapidly while the pipe is being sounded in the normal manner. The opening and closing of the hole causes a pronounced and rapid vibrato. See vibratone (a related pipe).