V.2 and v.6 composed by Du Fay with certainty
V-CVbav-ms-Arch.Cap.S.Pietro.B.80: 'In festo omn[ium] s[anc]tor[um]' / 'Cont[ra]tenor a faulxbourdon'
V-CVbav-ms-Capp.Sist.15: 'In nativitate domin[um] hymn[us]' / Tu lumen: Above 'Tenor': 'Contra in faulx bordon'