The most difficult part in this process should be sound editing. As I wrote in the previous blog, no matter whether I need background music or not, each scene still needs to be matched with sound. In the first sequence of my video, there will be a reminder sound when the electronic clock button is operated, similar to a beep sound. But in the end part of this video clip, the clock does not make a sound during the process of long pressing the button to make the number change continuously. So I have to use Adobe Audition to extend this beep sound by myself to achieve the effect I want. Therefore, in this editing process, I learned how to use the function of ‘stretch and pitch process’ and also changed the stretch of certain parts of my footage audio.. This is also the first time I opened the file in the Pr and then edited the file in Au.