Interesting article. EngineSim is good to know about. Clipping the audio when it is == 0 is also a good insight. I usually do the [sample][sample but backwards] trick to make it 'seamless' but that is only because clipping at 0 didnt occur to me lol.
I'd be interested in knowing you you did the skidding sounds. For my car game I had to search 'electric car drifting' or thereabouts, and grab a portion of the audio from that. Did something similar for engine noise as well. Not ideal as you don't have much control over the output and probably not licenceable in a paid game
