Here is a tiny speaker app using a Muse Proto board
with 2 running modes:
It uses 3 buttons:
You have to add the Muse specific library (muse_lib) to Arduino libraries
For example using these bash commands :
> cd ..../museProto_radio
> cp -r muse_lib ..../Arduino/libraries
You have also to copy some audio files from the "data" directory to the flash memory
with Arduino : => Tools => ESP32 Sketch Data Upload