• How important are the acoustic conditions in sacred spaces? Do there exist ideal conditions?
• Are there good and less good conditions for the practice of religious rituals going beyond speech intelligibilty or the apropriateness of reverbation time?
• Are there repercussions of room acoustics on the historical development of textual and musical contents of the rituals?
• Are there repercussions of space on the implementation practice of the rituals?
• Which are the intercultural and interreligious commonalities and differences and how do they depend on the acoustic-architectural characteristics of sacred space?

Subproject A 1: St. Gallen, Cluny, Citeaux, Hirsau: In search of lost sounds