60 c) Finally, only instruments which are personally played by a performer are to be used in the sacred liturgy, not those which are played mechanically or automatically.
71. The use of automatic instruments and machines, such as the automatic organ, phonograph, radio, tape or wire recorders, and other similar machines, is absolutely forbidden in liturgical functions and private devotions, whether they are held inside or outside the church, even if these machines be used only to transmit sermons or sacred music, or to substitute for the singing of the choir or faithful, or even just to support it.
However, such machines may be used, even inside the church, but not during services of any kind, whether liturgical or private, in order to give the people a chance to listen to the voice of the Supreme Pontiff or the local Ordinary, or the sermons of others. These mechanical devices may be also be used to instruct the faithful in Christian doctrine or in the sacred chant or hymn singing; finally they may be used in processions which take place outside the church, as a means of directing, and supporting the singing of the people.
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