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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Maybe take a look at: http://www.espruino.com/Waveform
You can't decode MP3s right now but if you write a raw audio file then you can play that. I'm not 100% sure how well it works on ESP32 but it's fine on the official boards anyway