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tracker bar

· January 15, 2016 ·

In a roll-operated instrument the wood or metal bar containing a series of spaced openings through which air passes in order to actuate a pneumatic mechanism (or to directly sound a note, in the case of paper-as-a-valve organettes). * Synonyms: tracker board (term rarely used), keyless frame (in fairground organ and dance organ terminology only; mainly European usage).

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