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They can put a man on the moon but you still need to tune your guitar one string at a time. What’s with that?  What is this, the middle-ages?
Polyphonic tuning, or sounding each string simultaneously so you can easily identify if a particular string – or strings – is out of tune would make life much easier than having to check each, one at a time.
It’s not that easy though.  Isolating each string amongst the harmonic overtones of the others isn’t easy to do.  Until now… Possibly.
This Danish software engineer …