Home / Forums / General melodica discussion / Compound pipe for Hohner Super force 37 / Reply To: Compound pipe for Hohner Super force 37 Reply To: Compound pipe for Hohner Super force 37 May 22, 2014 at 7:46 pm #2359 jazzman1945Participant The advantage of the composite tube that moisture accumulates not inside the instrument, but at the joints, between 1 and 2, 2 and 3, 3 and 4, 4 and 5.