Creating a Piece for Communion for the Baptism of Christ

A few days ago I created a piece for organ based with two manuals and pedals on the melody of Gregorian chant for the communion of the Baptism of Christ - "Omnes qui in Christo", Op. 37. The Latin text is taken from the Galatians 3:27:

"Omnes qui in Christo baptizati estis, Christum induistis, Alleluia." (For as many of you as have been baptized into Christ, have put on Christ, Alleluia).

While I was composing, I recorded this process with my explanations so that you could follow my footsteps. Here's the end result.