Home / Forums / Melodica construction, repair and maintenance / Material test on Yamaha P37D / Reply To: Material test on Yamaha P37D Reply To: Material test on Yamaha P37D May 11, 2015 at 1:48 pm #5012 OfirParticipant After some time playing with the piece of wood inside, here are my impressions: 1. The instrument is noticeably louder, in a good way. 2. From the player’s position the sound is rounder and deeper. This is a subtle change, although it clearly sounds. 3. The instrument vibrates more with the sound, which is has a good psychological effect on me as a player (I also love that in pianos) It may present a nice alternative for adding the benefits of wood to the instrument’s acoustic without changing its tight air chamber, and without compromising on the quality of the instrument (unlike Mylodica).