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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
Have you tried something longer, and a bit easier to listen to - like music? The sound sample you had was quite short and not very easy to hear.
Actually looking at it, the sample is around 0.5 sec long? So at 4kHz you'd expect it to be ~2000 samples = 2k bytes.
However it's ~17k? and in the bottom left of your image you can see 'project rate' is still 48kHz.
It could be it is playing, but it's basically 10x slower than you're expecting so it sounds totally wrong?
Also - if it was only a few k, you could load it into a string as you were doing before and play it that way, since it's a lot smaller.