Hey Evil F6. I used to have this as well in my BF XR6 Magnet Ute. I got the same whine using the radio transmitter I think. I bought something from Jaycar, but it didn't fix it. It was a cap and transformer. I was going to try this eventually, but I stacked my car before I got a chance, try and make sure you have a common ground for everything, aux cable, radio/head unit, and the EX-10. Also before I got the Ex-10 there wasn't any whine unless I was charging it, maybe a wiring mod? If you want a spare cable I bought one and was going to cut the original cable. As an aside, the Ex-10 is awesome except the only problem I have with it is that if you leave the iPod plugged in it discharges the iPod. Again another wiring mod, hence the cable. Lol