Help with sounds

Can someone help me make a sound that only happens when the engine brake is active? Ik it’s been done before and requires LUA

 

Which engine brake and who has done it before if I may ask ?

 

like when you let off the throttle? and I think you did it actually, not sure tho

 

, what I made is a jake brake for the T-Series. I don't think BeamNG currently supports separate off load sounds. Perhaps they could be made in the same manner as I made the jake brake. That of course would involve a decent portion of dedicated lua code.