I have service software for your palm. I gave it to ok4now too. The buzzing noise in my speakers was a vibration between the edge of the actual speaker and the body of the car. Make sure everything's tight, because even a little gap makes the sound poor.
now HERE is the correct example of a useful post!!! (please email me a link to get this software...thanks!!)
she gave that software to me, too. I don't know if she knows a link to get it off the net.
