1. Key desk or keyboard unit of a pipe organ. Contains one or more keyboards (manuals), pedals, control stops, and other devices for operating the organ. 2. Center or piano section of a theatre photoplayer or pit organ.

Rank of bass pipes in a large orchestrion or band organ which play an octave lower than the usual bass pipes. Heinrich Voigt added contra bass pipes to many fairground organs, giving them a powerful, deep fundamental tone.

Low trumpet pipes in certain German fairground organs (e.g., Bruder, Ruth), which bridge the gap between the highest trombone and lowest trumpet pipes.

1. An independent melody, subordinate to the melody in a piece of music, and played simultaneously with the melody. 2. A division of pipes in a band organ which usually plays countermelodies, long sustained chords, low melodies, or other parts.

Describes two or more piano hammers or other sounding devices which are connected to play from the same hole in the music roll (or key in a key frame, etc.). In many coin pianos and orchestrions, the lowest bass piano notes are coupled to permit a better foundation of tone than would otherwise be possible from a 65-note music roll, for example.