Even if you play a concertina under an umbrella it is going to suck water in. After a very wet Morris Federation day of dance recently, I had"lost" several notes and one sounded continuously. The problem was the leather valves sticking - and then eventually drying out in contorted ways. It has taken me a week to sort out all the problems, which I did partly by very gently re-damping the offending valves and stroking them flat while they dried. Two questions arise...
1. Does anyone have