[JohnW63]

Some guitars are just more sensitive than others.

I didn't know a thing about proper humidity, until I got learned up, here. Even then, I wondered how much as fact and how much was hoop-la. My Ovation has been unhumidified for 35+ years and It looks fine. But, when I got a 2010 Guild, the action started getting lower in a few weeks in my below 20% humidity. I put an Oasis in it and kept it in the case, and it came back in a week or two. Then I started looking for the signs of low humidity on my other guitars. What I found is both Ovations have a complete lack of top curve and my old Legend was sunken. I've been keeping them in the cases and humidified since. They stood up to the stress fine, no cracks, but why not get them back to where they SHOULD be ? Even after months of trying, the Ovations are just slowly coming back. The Legend is no longer sunken in at the bridge, but it is not bowed up yet either. Maybe the same design that kept it from having detrimental issues also makes it slow to change in the other direction.