Pipenbuck (m)
(with) definite article: derAccording to Gehler one of the 2 names (the other being Dudelsack) replacing (in the 17th-18th century) all previously used terms.
Gehler, Ralf: Die Böcke von Hamburg. In: Der Dudelsack in Europa, mit besonderer Berücksichtigung Bayerns (1996), p.63.