The version that the Benedictines of Mary sing is in three parts, I believe, but I would not be surprised if they used their own arrangement. You might listen to it for reference?
Um, are you related to Antonio de Cabezon, the great Spanish organist of the XVIth century? He served Phillip II, went to England with Phillip, and developed a friendship with Thomas Tallis. I played one of his alternatim Magnificats in recital last Eastertide.
what sort of three-voice setting? — soprano/alto/bass — soprano/tenor/bass
The first verse of the Benedictines of Mary recording is in just two voices, basically the soprano and alto parts of Bach's harmonization. Perhaps that will suit?
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.