An acoustic space doesn't make any sound by itself. It requires an external sound to reveal itself to you. It's like standing in a spectacular cave with wonderful formations and colors around you. In complete darkness, you won't to see anything. Magnificent things need light to be seen. It's the same with acoustic spaces (the cave), silence (the darkness), sound (the light), and our hearing (vision).
There are many beautiful acoustic spaces around us that we barely notice. Among human-made spaces, places of worship are often beauties for our ears, too. When entering such acoustic spaces, sound lovers won't resist producing a sound to expose their particular sonic signatures. I will often clap my hands, just once, and listen to the echo and reverberation. However, these places really shine when one starts to sing.
Singing plays an important role to many religions as it touches responsive souls deeply. Not surprisingly, chapels and churches have been designed to resonate to the sound of the voice. Singing in a chapel or a church is a wonderful experience for the singer and the audience. This generator tries to recreate this ambience from a listener's perspective. So, here we are, in a chapel, with a couple of friends. El Grey and Enlia take care of the higher frequencies, and Les Amicroches, a Belgian male choir, are filling the lower register. And your humble servant is playing the harmonium. Sit quietly now and listen to the sound filling this sacred space.