Forum members might be interested to know that Dupré's final work for organ and orchestra, Résonances, has now been published by my business, Crescendo Music Publications. It is rather hard to believe it had to wait until 2019 for its premiere performance! The new edition has been edited by Tobias A. Frank and is available in both full score (parts on hire) as well as a reduction for piano and organ, made by Dupré himself. See https://www.crescendomusicpubs.com.au/items.php for further information. You can also hear it in the reduced format here.
cheers,
Daniel Mitterdorfer