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Expression Pedal

Q.When using the EV-7/EV-5 with a Roland combo organ, the organ sound is not completely reduced even though the pedal is fully returned to the "back" position and the Minimum Volume knob is turned all the way down. Why is this?

A.A traditional combo organ does not have a velocity-sensitive keyboard; that is, the sound is generated at the same volume regardless of how hard the keys are played. To allow for dynamic expression in the organ performance, a foot volume control (called an "expression pedal") is used to control the performance volume. Advancing the pedal to its full stroke (all the way forward) maximizes the volume, while moving the pedal back (toward your body) minimizes the volume. However, the volume is never turned down completely when the expression pedal is in the full back position, only reduced.

Roland VK-series combo organs mimic this behavior when an EV-5 or EV-7 expression pedal is connected, as this is a standard element of traditional organ playing technique.

In addition to volume control, the traditional combo organ's expression pedal alters the tonality (equalization) of the sound as the pedal is moved. The human ear is less sensitive to the high and low range of sound as volume is decreased. To compensate for this, the loudness of the high and low ranges is increased as the pedal is moved back and the volume is lowered. (This tone adjustment is similar to the "loudness" control found on many home stereo systems.) The expression pedal control on a Roland VK-series organ mimics this traditional behavior as well.

If you select a non-organ tone (strings, piano, etc.) on a VK-series instrument, the expression pedal will function as a normal volume control, and the volume will be reduced completely when the pedal is moved all the way back.


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