Play only when parameter is going on direction?

Hi. I have an engine.
I have made a general sound for it, but would like a burst sound to play whenever the “speed” value is going from zero and reaches a certain point. ( start up burst sound).
I don’t want the sound to play when the same point has been reached from any value above.
Only when below and going to the point. Not when above and going to the point.

Any way to do this inside fmod?

Hi, you could use my “ghost parameter” trick: Locomotive Engine Sounds -- A bit of an enigma - #3 by Alcibiade
However, that would be cleaner to implement that logic inside the game code.

Awesome. Thanks again Alcibiade:)