Sound has been available for model trains for a while. Early on, people were obsessed with synchronising the 'chuff' with the wheel position (and thus piston position). To do this they used to add disks to the inside of the driving wheels with black and white stripes printed on them. Then an opto-diode under the loco would pick up the wheel movement and produce the chuff accordingly. These days, it is much more common to link the motor output voltage and back emf to the chuffing sound and it works quite well. It gives a very satisfactory effect whilst not perfectly synchronising the chuff to the piston position - anyway when moving, it is virtually impossible to see any error.
With cars, you have the revving motor and then the gear changes. We don't change gears on slotcars so one would have to link up-shifting to acceleration and down-shifting to breaking - but how would that work on a small home track with plenty of corners - most of us flutter the controller ans we wiz around the track. I doubt that realistic driving sounds would be achievable linked to throttle etc, but I think that these simulated sounds may be interesting all the same.
We'll see when the car is on the track. A review will be forthcoming in a few weeks.