While that would work as a static effect, it would be nicer if the sound reacted to the car’s speed and gear shifts. However, the melody string based sound effects are hard to use for continuously updated background sounds. In case it helps, I updated my extension to add support for looping sounds. Here’s a quick experiment added to your prototype: https://makecode.com/_fj6FWRU6za54
(I’m a bit confused how this fits in with the board game, I didn’t follow the stream. Is it a minigame?)