Ah, reducing the rolloff limit of the Cybruiser's stomping should do the trick.

How to do that?

Something like this but with the Cybruiser's hoof sound obviously.



200 1200 are the default values. 200 is distance from centre that sound is played at full volume. 1200 is distance from centre that sound radiates until it can no longer be heard at all. Just change is to something like 150 800 or 100 600?

Does anyone know why the cybruisers are alterted in the first place?

The hell knights aren't affected and the script to lower the key doesn't do anything special. Adding sound-blocking lines doesn't help either.

Added