I recently bought the Panasonic AG-DVC7, and I am very happy with it. My only problem is that when I plug in the external mic, it creates a loud humming noise on the recorded audio. At first I thought it was just the microphone that was messed up, but after trying a few different mics, I realized it was the camera. I called the Panasonic help hotline, and they told me that I needed to buy a certain part or mixer because the model type is messed up or something stupid like that. Does anyone know what exactly I need to buy in order for this to work? Please, It would be very kind of you to answer back, thank you very much. -Michael F.