Can someone check if this addition is not one and the same with the Hymn of the Vesper Service?
'''Hypakoe''' or '''Ypakoe''' (Greek: Υπακοή, from the verb υπακούω, "hearken" or "give ear") is a [[troparion]] sung at [[Matins]] on [[Great Feasts]] and [[Sunday]]s:
# On some Great Feasts it occurs after [[Biblical Odes|Ode]] Three of the [[Canon]], and on [[Pascha]] it is also sung again at the [[Liturgy]] with the [[Pascha#Hymns|Paschal troparion]] and [[kontakion]].
# On Sundays it comes after the [[Evlogitaria]] of the Resurrection and the Small [[Litany]].
# The Sunday Hypakoe is also read at the Sunday [[Midnight Office]], after the Canon to the [[Trinity]].<ref>''The Festal Menaion'' (Tr. Mother Mary and [[Archimandrite]] [[Kallistos Ware]], Faber and Faber, London, 1984), p. 561f.</ref>