Using Console Devices: Items
Some electronic organs that have no separate Great and Pedal expression pedal include a “Great-Pedal Enclosed” thumb piston or stop. Normally on power up, the Great and Pedal divisions of these organs imitate a traditional pipe organ (that is, they are not enclosed and are not affected by the expression pedal). But when the “Great-Pedal Enclosed” is engaged, the volume of the Great and Pedal is controlled through an expression pedal. On two-manual organs with only one expression pedal, the entire organ is expressed through the Swell expression pedal. On three-manual organs with two expression pedals, the Great and Pedal divisions are normally expressed through the Choir expression pedal.
To try this, pull stops on the Great, Swell, and Pedal. Play notes on the Great and the Pedal while closing and opening the Swell or Choir expression pedal. There should be no change of volume. Next, engage the “Great- Pedal Encl” piston or stop and try it again. You should now hear a change of volume.
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