Niche question regarding chant tones and liturgical rank
Laudetur Jesus Christus.
Personally I distinguish between Optional Memorials and Obligatory Memorials by taking the non-proper material from the Temporal in the former and from the Commons in the latter. Do hymn tones belong to these categories as well?
What I mean is that even though Terce, Sext, None and Compline ordinarily have no Sanctoral variation on Memorials, the corresponding hymns do have tones particular to when the liturgical day is a Memorial (compare Te lucis's ferial and memorial tone).
When celebrating an Optional Memorial and taking everything non-proper from the Temporal (i.e., only commemorating in the Concluding Prayer at Lauds and Vespers), would one still use the hymn tones of the Memorial at the minor Hours?