Home / Forums / General melodica discussion / Hohner history / Reply To: Hohner history Reply To: Hohner history February 24, 2015 at 2:28 am #4211 LowboyParticipant Alan, What do you mean by vertical Piano 27? Does vertical refer to the model with keys versus the model with buttons? Is vertical your terminology or official terminology? Inquiring minds want to know. Thanks. Lowboy