There is a recent post on macosxhints.com about how to Fix fading sound in Apple’s in-ear headphones. It recommends disassembling the earbuds and then blowing through the mesh to clean off the earwax. A comment to that post, by user ucfgoofy suggests that a simpler solution is to use clear adhesive tape. I tried this approach and didn’t get very good results with the clear tape. So I tried a piece of duct tape, and that worked great. After the cleaning process, I tested the earbuds and was shocked by the difference in sound volume.