analogWrite to pins A0 and A7 produce different outputs

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Gordon
Ok, at least we're getting somewhere!

Can you turn an LED attached to pin A0 on and off manually with digitalWrite? And what does getPinMode(A0) report?

If you power on the board and run just the two analogWrite lines:
```
analogWrite(A0,0.5, {freq:1});
analogWrite(A7,0.5, {freq:1});
```
With nothing connected to the board apart from 2 LEDs, do the two LEDs flash? Because I'm trying that here now and it's fine - so it sounds like it could be a hardware problem, especially if you can't even use digitalWrite on A0.

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