Use SPACE or the left/right arrow keys to navigate through the slides. If you want to stop the music, press P. Then, if you want to restart it, press P again.
This project was inspired by Adam Neely's YouTube video on the same topic (https://www.youtube.com/watch?v=TYhPAbsIqA8). I'd also like to thank @-Hologram for their post on the forums saying that microintervals were possible to create in Scratch, which basically inspired this whole project.