Open this page at https://cifertech.github.io/sound-meter-microbit/
Use as Extension
This repository can be added as an extension in MakeCode.
- open https://makecode.microbit.org/
- click on New Project
- click on Extensions under the gearwheel menu
- search for https://github.com/cifertech/sound-meter-microbit and import
Edit this project 
To edit this repository in MakeCode.
- open https://makecode.microbit.org/
- click on Import then click on Import URL
- paste https://github.com/cifertech/sound-meter-microbit and click import