I’m just about finished with this hymn. At this point I am just generating new versions until I find one I like. The piece is scored for French Horn, Trombone, Tuba, Finger Pianos, and vibraphone. The tuning is 72-EDO, using the following notes:
This version goes forwards and backwards in the piece at different times as much as 10 chords at a time, plus much use of the drunkard’s walk markov chain where it’s random whether the next chord is forwards or backwards in the list. This iteration includes chords 1-14 plus 36-42. You never hear 15-35, since the piece is only 4 1/2 minutes long. There seems to be a bug in Csound tempo operation that is limited to 100 tempo changes in a piece. I’ll try to track that down with the developers.
In the mean time, enjoy iteration #6.
Or download here: Rock of Ages, Cleft for Me.