In the 1886 edition this was relaxed to no organ in Office, and organ in Mass only, if music is used, in such a way that the organ is silent, when there is no singing.In Missis et officijs defunctorum nec organo nec musica, quam figuratam vocant, utimur, sed cantu firmo, quem etiam in tempore Adventus & Quadragesimae in ferialibus diebus adhibere convenit. (Caer. ep., lib. 1, cap. xxviij., n. 13.)
In Officiis Defunctorum organa non pulsantur: in Missis autem, si musica adhibeatur, silent organa cum silet cantus; quod etiam tempore Adventus et Quadragesimae in ferialibus diebus convenit adhiberi.
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