I actually composed this back in 1980 and played here with very slight modifications.
At that time I was assistant organist at the Shrine of the Immaculate Conception in Washington D.C.; one of the largest Catholic Church buildings in the world with cavernous acoustics like this sample set.
This a new upload; a previous one had a problem in the audio; it has been re-recorded.
Those who placed comments before, welcome to do so again. My apologies.