unless it is specifically referring to the strictures of Advent & Lent.
you're referring to GIRM 313, which the missal approved for use in the USA
EDIT: it looks like you're referring to GIRM 313, which the missal approved for use in the USA also translates as "only in order to support the singing". [specifically for Lent; moderated/restrained usage of the organ is permitted in Advent]
Is this an TLM (FSSP, ICKSP, SSPX, etc.) Ordo or Novus Ordo Ordo?
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