A vibrating reed or, less common, a tooth in a tuned comb.

1. Tuned tine or projection, usually made of hardened steel, used to sound a note in a music comb. 2. Projection in a gear (toothed drive wheel).

French term for key.

tracker bar scale. Diagram or listing of the function of each hole in a tracker bar.

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).