I recently bought a Martin D-1 from a guy that was unaware of humidity issues. The guitar looks like its in great condition (no cracks, fret ends are not sticking out) but it is beginning to dip downward between the sound hole and the bridge. I just saw a video of Bob Taylor fixing this problem by using a few dampits and covering the sound hole. My question is, do I have to use dampits and cover the sound hole or can I just use a regular humidifier (oasis OH-1) and kep it in the case for a week or so? I bought the OH-1 before I saw Bob Taylor doing the dampit trick. Any suggestions would be appreciated!