Hey Paul,
I believe the controller is making a bit of a squeal/whine at times.
If you watch the tire spinning video, a split-second before the wheels start to spin, you can hear it.
Did you notice that at all when you were testing it? Is it part of the PI looping thing? It seems to happen when accelerating.
This video is also one of the few times I have HEARD the Metro in action. Inside the car, it's kind of loud, because most of the interior is removed. On the outside, all you hear is traffic, the wind, and flying gravel!
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