Mainlines Cars with Krellnut Wagon Sounds

Does anybody know what i need to do to get his sounds to work with these awesome new cars from mainlines?
https://www.railworksamerica.com/forum/
https://www.railworksamerica.com/forum/viewtopic.php?f=29&t=15538
buzz456 wrote:Do you have WJSounds checked in the scenario where you are trying to run these cars? They are set up to use Walter's sounds.