WebUSB / Headphone connection to Espruino

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dave_irvine
@Gordon hmm, I've tried setting the pinMode but I'm not getting any response out of setWatch. I've used various tone generators but nothing ever seems to trigger.
```
setWatch(function(e) { console.log(e.time-e.lastTime); }, A5, { repeat:true, edge:'falling' });
```
I'm relatively sure my circuit is right, can you think of anything I might be missing?

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