Aristide No. 1 is a composite sample set, which tries to imitate the sound of the the great Aristide Cavaillé-Coll organ at Saint-Ouen in Rouen, France. The mixtures of Saint-Ouen have been reconstructed rank by rank using the original specifications.
Sonus Paradisi Caen Surround (v2.51) + Dom Bedos Demo are required to use the set. You will also need the Metz sampler set from Milan Digital Audio to run this sample set.
The creator of this composite sample set is: Christoph Schmitz. You can acquire this sample set from his web pages, it is not distributed by Sonus Paradisi.