This audio clip, titled "Knocking_04_old", encompasses the distinct sound of knocking on a door. It's not just any ordinary knock, but it brings to mind an old, perhaps wooden door, being knocked upon. The sound effect resonates with a certain antiquity, a knock that you might hear in an old house or a historical building. The knock is firm, yet it carries a certain echo, a resonance that only old and well-used doors tend to have. It's a sound that's immediately recognizable, evoking images of visitors from the past or even a sense of mystery or anticipation about who might be on the other side of the door.