My hammered dulcimer strings have a ringing, "twangy" sound that persists after I strike the string; this is preventing me from playing. I thought this had something to do with a humidity level in the atmosphere that is too high. I had trouble last summer with an 80% humidity level in the house. I dropped it down to the 50's with the help of air conditioning and it solved the problem. This winter I have tried to keep the humidity level at between 35-40% and my strings are "twanging" again. Humidity too low? Someone suggested I raise the humidity level to 45% which I am trying to do. Level is at 42% today and still twanging. Any advice here Thanks.