I recently purchased the in-ear headphones from iPod, and up until they have been great. However recently the sound has become quite quiet and im guessing that the ear phones just need cleaning. So I looked around trying to find out how to clean the earphones and I found thiss. remove the rubber bit. The O shaped diaphragm must be cleaned with a needle Gently feel around until you can feel a hole in the diaphragm, and push through it. There must be a hole in each side for the sound to get through. There holes often get clogged with earwax eyc, and need to be kept open. If you do that the sound should return to normal. an them, and i found this is this advice right? and if it is, what is the o-shaped diaphragm? thanks in advance!