Portions of the tenor voice and soprano voice have striking similarities to the communion Beatus servus chants found in the Graduale Pataviense and Gradual Romanum. I have indicated the quilisma found in those chants in the incipit and tried to indicate those notes which appear to match what chant sources I can identify. The chant specific to Conrad in the Constance diocese might have been like these other chants for the saints but have variances for this local saint.
Beatus servus quem cum venerit Dominus invenerit vigilantem amen dico vobis super omnia bona sua constituet eum
Blessed is the servant whom the Lord, when He comes, will find vigilant. Truly, I say to you, He will establish him over all His possessions