1. Place down any sound source (car with engine running) and stand next to it.
2. Open the map screen. Do not close the map screen during these steps.
3. Start running forward.
4. The sound of your footsteps will grow quieter as the sound of the car remains as audible.
5. Run backwards back to where you opened the map screen, note how your footsteps will begin to grow louder once again.
6. Closing the map screen fixes the problem and allows you to hear what is going on around you again instead of around the spot where you opened the map.