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 16, 2015 at 12:42 pm #5225 LowboyParticipant Now that I think about it, the reed plate may need to be upside down, which would cancel the easy tuning but not the easy replacement. Lowboy