I am studying computational mathematics and so we often deal with sound manipulation algorithms.
As this study has piqued my interest in the subject I was wondering how to go about learning some of the neatest engineered sounds that I hear.
My question is about the sound that occurs from seconds 0:14-0:24 in this song on youtube. What is it called to have a sound fade away in this manner? How could I go about finding the mathematical underpinnings of how this is achieved (so that I can recreate this effect myself)?
Thank you for your help!