Enable Scratch to record your voice, then say some words. They will produce sound waves based on the loudness of your voice.
This project is based on French inventor, Eduard Leon Scott de Martinville, who was the first person to invent a machine that could capture sound from air, the Phonautograph. His first experiments began in 1853/1854, which recorded a voice and a person playing a guitar. Later experiments up to 1857 were crude and experimental. Not until 1860, however, was the Phonautograph perfected. The final Phonautograph recorded sound when a person cranked the machine, spoke into a horn, while a stylus drew the vibrations on paper covered with soot.
