The cathedral's new organ is about to be blessed and of course we all know the beautiful language etc. concerning the blessing of the organ in the Rite of Blessings.
However, our bishop mentioned that there is an organ blessing rite that has the celebrant and the organ "speak/sing" in dialogue (the organ basically being the "other voice"). It apparently dates back centuries...

Does anyone on this forum know anything about this? Where to look for it etc?