[Nadya]

The fraction was pulled out my behind as a "Yes, there are edits that - even if completely pointless to make - are made nonetheless and nobody will ever know about it without being told it has been edited and anyone claiming otherwise is a liar."

I'm not sure the point of the Tone Deafness test - I scored a 31/32 but on many of the questions if one tone had been replaced with the lower/higher tone I'd never know it had been replaced despite my ability to tell them apart from one another. My point wasn't that you couldn't tell A from a very similar B (you can!) but that if A had been replaced by that similar B in the first place you'd never have known (because you couldn't!). You'd need to have been privy to the editing process to actually know if it had been edited at all.

Imagine an A/B test where A has been removed entirely and you've been asked which edits B has made to A. It's a very different test from an A/B test where you can compare A with B. While a trained ear may be able to hear obvious edits there are literally hundreds of non-obvious edits made to songs during production that you couldn't possibly know about without hearing the original recording to compare against.