You can watch a video explainer here (YouTube) which goes into a bit more detail on the audio capabilities of the device.
This project is a nice little demo of audio on the M5Stack Core 2 with some simple visualisations.
You'll need to use PlatformIO to build the project.
To clone the repo use:
git clone https://github.com/atomic14/m5stack-core2-audio-monitor.git
Hopefully, the code should be easy to understand.
If you want to add some more visualisations then please open up a pull request and contribute some code.
And if you'd like to buy me a coffee...
