Looking around a little deeper for the source
of the recording linked to in the previous post.

That link goes to an album anthology
with many different ensembles performing,
the tracks come from diverse other sources.
And

"Joseph liber neve myn" appears to come from a group called
"Ioculatores" and their album
"frofro," dated 2001, on a German label called Raumklang,
distributed by Harmonia Mundi.