In addition to being a composer, he appears to have been an innovator in notation of instrumental music:  in an instruction manual for the viol (1548, now lost), he is known to have produced the first viol tablature in France.
In addition to his role as a composer, he seems to have been a trailblazer in the development of instrumental music notation:  in a guidebook for the viol (1548, now gone), he is credited with creating the initial French-style viol tablature.