We just got the new '06 Prius and much to our surprise, it had an audio line-in port. So we bought a mini plug to mini plug cable at radioshack. At first we were happy with it, but there is a very noticeable sound problem. The ipod has to have the volume up all the way in order to get any sound at all. When we turn the car radio up, it creates a very annoying white noise. This effect is more noticable on some songs than on others. On the really bad ones, the shrill, white, ear-piercing noise is always present. We try to sync the car radio volume with the ipod volume, but that doesn't help. It seems like we are not getting enough signal to the sound system. Is there something wrong with my car?