As a child I learned (from one of the Boni Fireside books?) that in Colonial Pennsylvania the Moravian missionaries held a Christmas powwow where In dulci jubilo was sung simultaneously in twenty-four languages, including at least half a dozen Native American tongues (Mohawk, Delaware, what have you). It was not stated whether these were all macaronic versions — seems to me the "order out of chaos" feeling of twenty-four diverse scions of Babel suddenly melding into a single phrase in Latin and then separating for another line or two before reuniting must have been really powerful, if that's the way they did it!

Haruo