I believe the antiphon is found in the transfer of the Blessed Sacrament after Adoration of the Holy Cross on Good Friday in the EF. It also exists in Responsorial form in the 1967 GS.
Quite recently, on or about April 3rd, I posted in this thread also linked to it in this thread my own setting of "We adore you, O Christ" ( Adoramus te, Christe ), for two voices (nominally Soprano-Alto, although Tenor-Baritone is just as viable), with both the English and the Latin text underlay. Here are the links:
Are you looking for a choral setting or something that could be sung by the congregation during the Stations of the Cross?
Two simple settings that involve the congregation are found in the Canadian Catholic Book of Worship III at #355 (by Michel Guimont) and #366 (by Murray Kroetsch).
Regarding Kevin's good suggestion of using the possibility of using the Dubois from the St. Gregory, whether it's a capella or accompanied, have the melody (Sop. part) sung by men, and women sing the alto if it must be sung in two parts only.
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