From Tournemires 'Variae preces, Op.21, 40 pièces pour harmonium', composed in 1901-1902, piece number 16: 'Entrée - Très modéré'. See attachment (pdf).
I tried to make an organ piece of it, not thinking about the original instrumentation (harmonium) at all. I was triggered by the mood/character in the piece, choosing the dark brown colors of the Waldsassen instrument.
Also this performance is played on the upcoming sample set by Forestpipes: Waldsassen, Stiftsbasilika (you hear the Beta-version).