Home / Forums / General melodica discussion / Sound Test Hohner Professional 36 & Wooden Yamaha P-37D / Reply To: Sound Test Hohner Professional 36 & Wooden Yamaha P-37D Reply To: Sound Test Hohner Professional 36 & Wooden Yamaha P-37D July 7, 2016 at 3:27 pm #7363 Bruno TraviParticipant I will try to fill the inside with cork sheet , see what happens