Treeline said:
Here's a link to Frank Ford's incredible site - this one deals with mystery buzzes, but the whole place is well worth exploring. What a fantastic resource!
Frank Ford's link on Buzz Diagnosis
Frank is a good friend, and one of the smartest repair people around. However, he (living as he does in the San Fransisco area) does not have much experience with humidity issues. He once told me that he has, in the last 35 or so years, had only one humidity related crack in his shop. This was one the things which helped me realize just how regonal guitar maintinence really is.
For what it's worth, those A frame braced Martins (the 16's, the 15's, the 1's and anything with an X in the name) are extremely prone to humidity issues, so even though they are inexpensive guitars, you really have to keep on top of the humidity all the time.
I've writen more a few posts on this, so if you want an upper midwest view on the subject, look them up. I do NOT recomend the Planet Waves humidifier, by the way, for two reasons. First, it is a pain in the ass to fill, so you are less likely to do so; and second, it is made of a hard plastic which could easily damage the finish on your guitar. It is also completely useless if you don't put your guitar IN THE CASE. I don't know if that is or is not what your son is doing these days, but if not, you should get him a Kyser Lifeguard. They are still more effective in the case, but they will work out of it.
Light
"Cowards can never be moral."
M.K. Gandhi
