How to create ornamented chorale melody?

Playing a hymn harmonization in four parts with the soprano voice on the solo manual might be fun to listen to and to play. However, did you know that once you can do this, you are only a few steps away from creating a beautiful ornamented chorale melody?

This in a sense is a technique that North German Baroque composers, such as Dieterich Buxtehude used to create ornamented chorale preludes. I'm sure that after learning about this technique you will be anxious to try it out on your favorite hymn tune.