This composition is based on the Ad te levavi Gregorian chant Introit for the 1st Sunday in Advent. It has 10 sections - each section for one chorale phrase. The registration is done for at least a two-manual organ in mind.
The fast sixteenth-note episode with pedals alternates with the slower quarter-note motion without the pedals.
Advanced level. PDF score. 10 pages. Duration - 9 minutes.
Check it out here