Anyone having a more specific tutorial on how to get this to work?
I already own a copy of ATC-Chatter
I'm not sure what else I can add specifically. You're basically running the ATC Chatter app independently from the sim and playing the sound files in background, setting them to wherever you are flying. That's why it is necessary as I mention in directions to unclick "only play chatter when your COM1/COM2 radio is powered up". So maybe a good first step is to follow the directions above and see if you can play the sound files on your pc without loading the sim. It's a pretty easy process, but I'm sorry if I didn't explain it well.