A website for recording enthusiasts features an instructional video on how to change a sound track by simply clicking on it. The curve that signifies the way the music sounds is called a Bezier curve. The editor can do it by mouse or by clicking the keys Alt and Drag. In addition, the editor can use the mouse to adjust the process of fading sound tracks in or out. The program used to do this is called Reaper.
Read more: Quick Tip – Bezier Envelope and Fade Curves