Question: What is the visual difference between an over strung and understrung piano? 

Answer: There is no visual difference. Sound quality, unless of course you're tone deaf. If you've bought a new piano they will tune it for you when delivered but must be re-tuned again after it settles, usually within a year. If you play alot afterwards you'll need tuning more often.\n\nIn this case it's sound, not sight.
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