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An echo organ is a specialized division of a pipe organ, set apart from the main instrument. It contains soft-toned stops specifically designed to create echo effects in music. This is related to the concept of reverb, which is an electronically produced echo effect used in both live and recorded music.12

An electronic organ is a keyboard instrument that generates sound electronically and plays it through loudspeakers. These instruments were developed as a more affordable and compact alternative to traditional pipe organs. The term "echo" itself refers to the repetition of a sound caused by the reflection of sound waves, or a soft repetition of a musical phrase.34

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