Go inside the project, there are comments explaining how to use it! This project records the loudness when you record, so you can pair this with a song, go into a quiet room with your volume at full, start recording, play a song, and then stop once it's finished. When someone plays your project, make that song start playing when the green flag is clicked for them or see a colorful sound wave thingy!
Made by @Hammykat-_-