ATC Chatter is real ATC communications that have been recorded and clipped, and used in Pilot2ATC so it feels more immersive. The types of ATC is properly separated to the matching frequencies, but not according to your location. For example, if your talking to Tower, you’ll hear ATC tower communication in the background, but not necessarily at the airport your at. It’s simply background chatter, and adds a lot to the immersion… especially since it’s real communication. (Real, but not real time. It’s pre recorded)