Hello and welcome to my .wav file exporter! A WAV file is considered one of the simplest audio formats out there so why not make a Scratch project about it? In this project, you can create a wave and add noise or you can record the loudness of your microphone and listen to it. When you're done, click Generate .wav and paste the text into your URL bar. Technically, you can do much more with this such as creating a custom curve and expanding the length of the file, but this is just for demonstration purposes.
Information on the .wav format: http://www.topherlee.com/software/pcm-tut-wavformat.html https://stackoverflow.com/questions/13039846/what-do-the-bytes-in-a-wav-file-represent Credit to @TheLogFather for explaining how to get around the variable length limit: https://scratch.mit.edu/projects/24934494