That Sound Effect at Change of Shift and how to remove it

Hey guys, I'm recently getting back into the game.


I've got a mod soup going for OM and I'm running into an issue. The issue is during TC, the shift change whistle happens every 3 seconds at high TC.


I remember having this issue in time's past, and I have forgotten how to solve it.


Can anyone tell me the name of the sound file I need to remove to prevent this from happening? It's driving me insane.


I had all this info and files saved on a thumbdrive, which my dog has eaten.