Home / Forums / Melodica construction, repair and maintenance / Tuning and Gapping Hammond Bass melodica / Reply To: Tuning and Gapping Hammond Bass melodica Reply To: Tuning and Gapping Hammond Bass melodica June 7, 2015 at 1:23 pm #5428 Alan BrintonParticipant Maybe by high and low notes you mean high and low relative to the particular keyboard, so that it’s the notes closest to the mouth that are easier to bend? This must be it since you bend on your HM-26 as well as on your HM-27? or no?