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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
Hi,
I'm afraid that right now you'll really struggle... While the implementation is quite easy, javascript code on Espruino just isn't fast enough to process audio at the rate required for decent quality sound.
I think you'd be better off with something with a bit more oomph - like a Raspberry Pi or native c code on an arm arduino board.