Home / Forums / Melodica construction, repair and maintenance / Changing range of Yamaha P37D / Reply To: Changing range of Yamaha P37D Reply To: Changing range of Yamaha P37D September 24, 2022 at 5:20 pm #14437 DarenKeymaster Just the Hammond 44, which goes to the C below the F on the P37D. Yes, 3D printing an adaptor section could work….