What Is ER-99? ER-99 is a web-based instrument 🎛️ based on a famous Japanese drum machine from the 1980s. It was built to celebrate 9/09 day 2022 🎉! All of the drums are synthesized using the WebAudio API. The hi-hats, crash, and ride cymbals are produced from sampled audio. The complete source code is available on Github. How do I play? You can play the drums by pressing the number buttons on y