| 摘要 |
1488102 Electronic musical instruments C G CONN Ltd 7 Jan 1976 [30 Jan 1975] 00549/76 Heading G5J In an electronic organ arranged for automatic chord playing the keyswitches have two different operated positions in which two different combinations of tones are sounded. In Fig. 5 depression of a key 45 to the position shown causes four of the wire contacts 53 to make with respective bus-bars 32 thus feeding to the bus-bars the root note, the fifth, the major third and the minor third intervals respectively. When the key 45 is depressed fully the fifth contact 53 engages with bus-bar 38 as well. As shown in Fig. 3, the root note and fifth are both fed direct to the output circuit of the organ (when a switch 24 is closed) while the thirds are fed via respective gates 27, 28 only one of which is made conductive by transistor 30. When busbar 38 is contacted transistor 30 changes state and the chord sounded changes from a major to minor chord.
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