| 摘要 |
In order to improve a control device for performance effects of an electronic musical instrument there are provided a photoelectric conversion element on the underside of a keybed below the manual keyboard of the electronic musical instrument and also a light source near the front side of the bottom part of the instrument so as to face the photoelectric conversion element. By interrupting a light beam from the source to the photoelectric conversion element with part of the player's body, the resistance of the element is caused to be varied to actuate a relay, thereby permitting the use of circuits of performance effects such as sustain, vibrato and reverberation.
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