Device which quickens the operation of an expression mechanism, altering a crescendo, decrescendo, or other volume level change from slow to fast. Used by Hupfeld, for example, in the Pan orchestrion.

To increase the loudness or intensity of a note or chord within a group of otherwise softer notes. Important notes in a melody may be accented by playing them louder, or by adding a percussion instrument such as an orchestra bell or xylophone, for example.

The part of a piece of music or section of an instrument that plays a subordinate part to the more prominent melody and countermelody sections. * German: Begleitung.

A portable hand-held reed instrument with bellows which are expanded and contracted by arm movements and which is played by means of a keyboard or buttons. Accordions fitted with pneumatics that play the keys and buttons automatically from behind are a popular feature of many Belgian dance organs. * European spelling: Accordeon.

Coin mechanism in electric pianos and orchestrions that keeps track of the number of coins that have been deposited and turns the motor off after an equivalent number of songs have been played.