The bass I own has been in my family since before I was born, so it is around fifty years old at least. When I took posession of the instrument, I was told that there was a setter with it because the soundpost kept falling. The last time I remember the bass being set up was around thirty years ago. since that time I don't remember the soundpost being an issue. My question is does this have to do with the wood drying and shrinking over time? Are there other factors involved? I plan on getting it to a luthier shortly after the first of the year to assess repairs needed. I was told by him to loosen the strings to ease tension so the seams would not open any more than they already have. I tuned down a fifth, and the soundpost is still in position. I am just wondering what is happening here. Thanks for your input.