While listening to the podcast, I actually found some techniques pretty useful and intriguing. Since there are a variety of sound effects, I felt a sense of presence. On one hand, to unveil it, they started by using a single narrator telling the main story with a clear voice. On the contrast, while entering certain situation, for instance when the detective was interviewing other kid, they use sort of vague sound ripped from recorder, as if we were also at the scene hearing them talking. In addition, they also add the sound effect of phone and the sound of opening the door, which I think is really intriguing. On the other, they choose different background music to represent different kind of mood. These two features for me, is actually the most interesting part about audio, that they create the listener a sense of presence just by listening.