Hmmm, doesn't look like it's working perfectly. I notice when you were changing volume it sometimes took several clicks to make the volume change by one unit.
the reason I'm waking up this thread is that I just took delivery of a 70D and, while I am incredibly impressed with just about everything in the car, the scroll wheels are driving me nuts. The fist issue is figuring out exactly what they are supposed to do between various permutations of clicks and rolls. But that can be learned. The bigger problems I have is with the need to move through multiple clicks to make a change. I thought maybe it was just my car but since it happens on both the left and the right I thought I would dig deeper and find out if anyone else was having problems.
My thought is that the scroll wheels are simple rotary switches that set off one pulse train when moving in one direction, and another when moving in the other. I've worked with rotary switches before and, depending upon when the switch circuitry is sampled, clicks can be missed or even mis-interpreted and go in the wrong direction. It's a very cheap way to build a circuit. I'm surprised that Tesla would use a circuit like this to implement such a core driver interface component.