Protege AP-31 digital organ, indicated by the organist's right foot.
A crescendo pedal is a large pedal commonly found on medium-sized and larger
crescendo (and, likewise, a diminuendo, when the stops are deactivated). The crescendo pedal is located directly above the pedalboard, to the right of any expression pedals
that may be present. In actual use, the operation of the crescendo pedal usually does not move the draw knobs or stop tabs on the console; the stops are electronically activated inside the organ. Often an indicator light or lights will be present on the console to inform the organist of when the crescendo pedal is activated and how far it is engaged.
swell pedal
(right)
The earliest type of automatic crescendo device was the Rollschweller (
Romantic music era organs of the nineteenth century, almost exclusively in Germany. It consists of a wheel and axle, which would be horizontally mounted directly above the pedalboard. When turned toward the organist, the wheel would activate a mechanism that would add stops to the registration. Likewise, turning the wheel back would remove stops. The Rollschweller is constructed so that it may be turned forward or backward indefinitely. This gives the device a much longer field of operation than the modern crescendo pedal, thus making the dynamic change more smooth and gradual. It is especially helpful and appropriate in the playing of the organ works of Max Reger, Franz Liszt, and Sigfrid Karg-Elert
, who all wrote for organs that featured a Rollschweller.
As the use of
combination actions
. As a result, in organs with these devices, the stops controlled by the crescendo pedal are usually customizable, as is the order in which they are activated.
of the late 19th and early 20th centuries often had a similar mechanism to a crescendo pedal. Since the player's feet were needed to pedal the bellows that provided the wind for the instrument, the mechanism was operated by a 'paddle' lever moved by one of the player's knees (the paddle being located under the keyboard). Usually this was called a 'full organ pedal', as it did not gradually engage ranks of stops in the manner of a true crescendo pedal, but simply engaged all the stops (and usually any octave couplers fitted to the instrument) when operated, with no progressive action.
Use of the crescendo pedal
The crescendo pedal is typically used only in certain repertoire, and, generally speaking, the organ's expression pedal(s) are more commonly used. Because the crescendo pedal both resembles and is adjacent to the expression pedal(s), it may confuse beginning organists, such as pianists who are filling in at the church organ, who intend to use the expression pedal(s) rather than the crescendo pedal. To avoid this danger, the organist should look at the pedals before playing to ascertain if they are labeled, as well as practice locating the correct pedal by feel. When feeling for a pedal while playing, the organist should remember that the crescendo pedal is normally the right-most of the volume pedals, and that its surface is often raised slightly above the expression pedal(s) so as to help the organist to avoid selecting it by mistake.
