Nice to hear you like it - thanks . The tones change accordingly to distance to the Flight Line, of course, so the pilot can smoothly fly into the "Green Zone". The tones were simplified to be not disturbing or annoying but at the same time the pilot knows exactly how far the airplane is from the flight line. There is a headphones port that can be used instead of speaker - it disables speaker and allows to hear tones loud and clear in case of disturbing noises around (like flying drones). There are separate tones to indicate out-of-area or other information (like gps fix lost etc.) - it can be configured though. I wasn't aware of LFR or anything like it. The sound patterns were "composed" by myself from scratch but in cooperation with F3A master pilot so I can say that it works
I will try to record the tones soon.