This is the brilliant fourth movement of this extraordinary work, which is based on the Gregorian Chant of the same name. This section is based on the text "To thee do we send up our sighs, mourning and weeping in this vale of tears."
Oliver Latry is currently one of four titulaires des grands orgues of Notre Dame, Paris.
The extension of this sample set adds 61/32 ranges (necessary for this piece) and two en chamade reeds playable from a fourth keyboard.