SOPP415: Tried to improvise a canon between the soprano and tenor

This question was sent by Jeremy, and he writes: Played for church this morning. Krebs e minor prelude and fugue for prelude, accompanied a handbell piece on the organ and ended with Piece Heroique of Franck. Standard hymns and some piano playing in there as well. I did improvise a bit today during the passing of the piece. Played through a hymn, then tried to improvise a canon between the soprano and tenor over a pedal tone while keeping the alto the same. I thought it worked pretty well.