Home / Forums / Buying a melodica / Advice wanted on the Suzuki M37C / Reply To: Advice wanted on the Suzuki M37C Reply To: Advice wanted on the Suzuki M37C November 4, 2017 at 10:20 pm #9427 DarenKeymaster Hi Joanna You need to learn how to tune your melodica! It looks like the M37C Plus has a flexible metal mouth hose with it. Its unlikely there’s any other internal difference to the M37C.