The document discusses audio recordings made in a canteen that were manipulated with effects. In the first recording, an effect called "boogex" was used to make the speaker's voice sound muffled, as if in a box, unlike the original recording where the voice sounded clear due to room acoustics. The effect also made a humming noise in the background louder and sharper, and added an echo making the voice sound like it was coming through an old radio. Background talking at the end of the original recording was not heard after effects were added as the loud humming covered it up and made the voice quieter.