"High-Pass Filter 3" is an audio piece that features a distinctive use of a filter effect, specifically a high-pass filter, which lets frequencies higher than a certain point pass through and reduces the intensity of frequencies below that point. The audio begins with a drum beat, providing the rhythmic foundation for the piece. As the track progresses, the high-pass filter is gradually applied, altering the sound of the drum in intriguing ways. The filter effect is skillfully manipulated, creating a sense of ebb and flow in the sound dynamics. This audio piece perfectly embodies the transformative power of the high-pass filter, turning a simple drum beat into a complex, rhythmic soundscape. The 'fx' tag indicates the use of special sound effects, which in this case refers to the high-pass filter effect.