On my previous tutorial, which is this one:
I made a pickup car with its wheel colliders and completely working. I can controll it to move by pressing arrow keys on my keyboard.
The next thing I need to do is to add engine sound audio file to the car with respect to its movement speed. So when the car is running fast the audio pitch must be increased, and also decreased when the car is slowing down and stopping.
What you watch here is the complete progress how I tried to achieve it.
If you need the working files / source code of what I did in this video, you can purchase this package.