A while back I recorded this lovely piece on a modern instrument and was frustrated that I couldn't use a Cavaillé-Coll sample set instead. The 56/30 range of those sets precluded playing the work as intended without transposition of certain notes down an octave. Also, the lack of an expressive Positif made using that division's celeste too loud as accompaniment for the Recit 4' flute, which is called for in the last section of the work.
Since that time "extensions" have been made to this original Cavaillé-Coll sample set which include 61/32 ranges and an enclosed Positif. That is what I have chosen for this recording. (Interestingly, in his later years Cavaillé-Coll created a proposal for the Basilica of St. Peter in Rome which included 61/32 ranges and two enclosed divisions.)