As far we know and examined in the sources is this Missa pro defunctis not complete it could consists out of the following movements:
01. Introitus - Requiem aeternam
02. Kyrie - Kyrie, Christe, Kyrie
03. Gradual - Requiem Aeternam
04. Sequentia Dies Irae
05. Sanctus *- Sanctus y Benedictus
06. Agnus Dei* - Agnus Dei
07. Communio* - Lux aeterna
08. Requiescant in pace*
09. Respond* - Libera me, Domine de morte aeterna
These movements are set in de Ionian mode and are set for SATB.
The above mentioned movements Sanctus*, Agnus Dei*, Communio,*Requiescant in pace* and Respond* are attributed to Juan Durango. They are found in an anonymous source/folio, Anonimo ff 43v-54 in Catalogo El Escorial Libros de Facitol O Atril (Lf) 10 n. 10. This Missa pro defunctis can be found in the Archivo Musical del El Escorial Madrid no 40080 and in the Catalogo del Archivo del Monasterio de San Lorenzo El Real de El Escorial p 27. f 10 n 8 & p. 28 f.10 n.10.

In the Officium Defunctorum Ad Mattutinum/Office of the Dead Matins there are nine lessons prescribed. This Responde mihi is the fourth of the 9 lessons for the Office of the Dead. This Lectio/Lesson is published in the Liber Usualis (edition 1936) page 1791. Juan de Durango sets this Leccion de difuntos Responde mihi for double choir SATB and SATB in coro spezzato style. Interesting is to refer in this case to the two collected Lessons, Lectiones sacrae and Sacrae Lectiones novem composed by Orlando Lassus (1532-1594) in motet-form. These collections are two Motet cycles each of which consists out of the nine Lectiones from the Book Job that is published in the Officium Defunctorum ad Matitutinum or Matins of the Office for the Dead which have been published in the old Liber Usualis (edition 1936), on pages 1782 -1799. These nine Lectiones were full part of the Office for the Dead from the eleventh Century until the Second Vatican Council in 1965 were substantial revisions and alterations of the total Office in the Catholic Church have been made. This Office for the Dead more specific these Lectiones would be read Ad Matutinum, in the morning prior to a Requiem Mass and the Burial. All nine Lessons in the Service were normally followed by a Responsorium. Lassus is as far as we know the first composer who set all nine Lectiones in one composition together.
In this case Juan de Durango sets as far we could found only the fourth lesson, nevertheless seen his position in the Monastery as maestro de Capilla we suppose the other eight lessons have been lost.
This Lesson Responde mihi is set in the Lydian mode and can be found in the Archivo Musical del El Escorial Madrid no 38804 and in the Catalogo del Archivo del Monasterio de San Lorenzo El Real de El Escorial p 262, no 643.

The ”Libera me Domine de viis” is in general a plainchant from the Officium Defunctorum/ Office of the Dead more specific a Responsorium sung at the closing ad Matutinum/Matins.
The Libera Domine in general is a well-known Respond in the Office of the Dead; there are in general (4) plain-chant variations of Libera (me) Domine known. This Libera me Domine de viis is an old Responsorium out of the Officium Defunctorum see the Liber Usualis (ed. 1936 page 1798-1799). There are about 138 Responsoria de Officium Defunctorum known and used all over Europe during centuries in the Office of the Dead. They are all well-ordered. This Libera me Domine de viis is Respond nr. 40. To this Repond belongs Versicle nr. 31 “Clamantes et dicentes”.
Juan de Durange sets this Respond for SATB in about 1670. There are two different publications in the Archivo San Lorenzo de el Escorial. This motet is set in the Dorian mode.
In the version biblionumber 40643 is concluded that the Bajo version is probable from maestro Diego Torijos (1653-1691).
This Respond Libera me Domine de viis can be found in the Archivo Musical del El Escorial Madrid no 40079 & 40643 and in the Catalogo del Archivo del Monasterio de San Lorenzo El Real de El Escorial p 27, (Lf) 10 no. 7. and in page 561 no 1919-no 9 & 10.