Home / Forums / Melodica construction, repair and maintenance / Possible Clogged Spit Valve / Reply To: Possible Clogged Spit Valve Reply To: Possible Clogged Spit Valve June 11, 2017 at 12:53 pm #8981 Alan BrintonParticipant It’s not unusual to have occasional note chokes with a Yamaha Pianica, Mark, usually occurring when a note is blown hard. If it persists, it’s usually because the reed gap needs to be adjusted. I have done this while tuning my P-37D. I wouldn’t worry about the moisture venting unless there are other symptoms. The P-37 is also not a melodica that requires frequent venting.