what is this sound effect. if you go to youtube and search Nero1x, and go to his 2nd newest video called loading, then go to 0:15 you'll hear a sound effect. Please let me know what this sound effect is called.
It is called a filter sweep. That is specifically a low-pass filter. A low-pass filter significantly reduces the volume of all frequencies above a set frequency (removes all the high sounds). The sweep happens when the filter is automated to lower to that set frequency. The frequency at which the low-pass starts gets lower and lower until you only have bass frequencies.