Expression pedal

（重定向自Swell pedal）

Swell boxon the Holtkamp organ in Bishop W. Angie Smith Chapel, Oklahoma City UniversityHere, the shutters are open.Swell box with shutters closed.

Crescendo roller (left) and Swell pedal (right)

An expression pedal is an important control found on many musical instruments including organs, electronic keyboards and pedal steel guitar. The musician uses the pedal to control different aspects of the sound, commonly volume. Separate expression pedals can often be added to a guitar amplifier or effects unit and used to control many different aspects of the tone.

单词	Swell pedal
释义	Swell pedal 英语百科 Expression pedal （重定向自Swell pedal） An expression pedal is an important control found on many musical instruments including organs, electronic keyboards and pedal steel guitar. The musician uses the pedal to control different aspects of the sound, commonly volume. Separate expression pedals can often be added to a guitar amplifier or effects unit and used to control many different aspects of the tone.
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