Home / Forums / General melodica discussion / Compound pipe for Hohner Super force 37 / Reply To: Compound pipe for Hohner Super force 37Reply To: Compound pipe for Hohner Super force 37 May 22, 2014 at 6:34 pm #2358 Melodica-MeParticipantJazzman, please explain the advantage of the compound pipe versus just a straight pipe?Melodica-Me